Optimizing Parallels Desktop for Mac for the best performance of a guest OS may seem to be largely a matter of customizing the performance of the guest OS itself, such as turning off visual effects in various Windows OSes. But before you start fine-tuning your Windows or other guest OS, you should first give the Parallels guest OS configuration options a tune-up. Only then can you get the best results from a guest OS.
In this guide, we're going to benchmark how well Windows 7 performs as a guest OS using Parallels Desktop 6 for Mac. We chose Windows 7 for a few reasons. It's the most current Windows OS available; it's available in both 32-bit and 64-bit versions, which makes it usable on just about all Intel Macs; and, perhaps most importantly, we just installed Windows 7 (64-bit) on Parallels to perform benchmark comparisons between Parallels, VMWare's Fusion, and Oracle's Virtual Box. With Windows 7 installed, along with our two favorite cross-platform benchmarking tools (Geekbench and CINEBENCH), we're ready to find out which settings have the most effect on guest OS performance.
Performance Tuning Parallels
Windows On Mac:: How To Increase The Size Of A Boot Camp Partition Jun 3, 2010. I want to make my windows partition bigger, but I don't want to have to delete my current one, re-partition, and then have to re-install everything. Optimizing Parallels Desktop for Mac for the best performance of a guest OS may seem to be largely a matter of customizing the performance of the guest OS itself, such as turning off visual effects in various Windows OSes.
We're going to test the following Parallels guest OS configuration options with our benchmark tools:
- Performance Caching Options (Faster Virtual Machine or Faster Mac)
- Adaptive Hypervisor Enabled or Disabled
- Tune Windows for Speed Enabled or Disabled
- Video RAM size
- 3D Acceleration
- Guest OS RAM Size
- Number of CPU/Cores
Of the above parameters, we expect RAM size and number of CPUs to play a prominent role in guest OS performance, and Video Ram Size and 3D Acceleration to play a smaller role. We don't think the remaining options will provide a significant boost to performance, but we've been wrong before, and it's not unusual to be surprised at what performance tests reveal.
Optimize Parallels Desktop - Parallels Guest OS Optimization
Optimize Parallels Desktop - How We Test
We will use Geekbench 2.1.10 and CINEBENCH R11.5 to measure the performance of Windows 7 as we alter the guest OS configuration options.
The Benchmark Tests
Geekbench tests the processor's integer and floating-point performance, tests memory using a simple read/write performance test, and performs a stream test that measures sustained memory bandwidth. The results of the set of tests are combined to produce a single Geekbench score. We will also break out the four basic test sets (Integer Performance, Floating-Point Performance, Memory Performance, and Stream Performance), so we can see the strengths and weaknesses of each virtual environment.
CINEBENCH performs a real-world test of a computer's CPU, and its graphics card's ability to render images. The first test uses the CPU to render a photorealistic image, using CPU-intensive computations to render reflections, ambient occultation, area lighting and shading, and more. We perform the tests using a single CPU or core, and then repeat the test using multiple CPUs or cores. The result produces a reference performance grade for the computer using a single processor, a grade for all CPUs and cores, and an indication of how well multiple cores or CPUs are utilized.
The second CINEBENCH test evaluates the performance of the computer's graphics card using OpenGL to render a 3D scene while a camera moves within the scene. This test determines how fast the graphics card can perform while still accurately rendering the scene.
Testing Methodology
With seven different Guest OS configuration parameters to test, and with some parameters having multiple options, we could end up performing benchmark tests well into next year. To cut down on the number of tests to perform, and still generate meaningful results, we're going to start by testing amount of RAM and number of CPUs/Cores, since we think these variables will have the biggest impact. We will then use the worst RAM/CPU configuration and the best RAM/CPU configuration when we test the remaining performance options.
We will perform all testing after a fresh startup of both the host system and the virtual environment. Both the host and the virtual environment will have all anti-malware and antivirus applications disabled. All virtual environments will be run within a standard OS X window. In the case of the virtual environments, no user applications will be running other than the benchmarks. On the host system, with the exception of the virtual environment, no user applications will be running other than a text editor to take notes before and after testing, but never during the actual test process.
Optimize Parallels Desktop - 512 MB RAM vs. Multiple CPUs/Cores
We'll start this benchmark by assigning 512 MB of RAM to the Windows 7 guest OS. This is the minimum amount of RAM recommended by Parallels to run Windows 7 (64-bit). We thought it was a good idea to start our memory performance testing at below optimum levels, to determine how performance does or doesn't improve as memory is increased.
After setting the 512 MB RAM allotment, we ran each of our benchmarks using 1 CPU/Core. After the benchmarks were complete, we repeated the test using 2 and then 4 CPUs/Cores.
512 MB Memory Results
What we found was pretty much what we expected. Windows 7 was able to perform well, even though memory was below the recommended levels. In the Geekbench Overall, Integer, and Floating Point tests, we saw performance improve nicely as we threw additional CPUs/Cores at the tests. We saw the best scores when we made 4 CPUs/Cores available to Windows 7. The memory portion of Geekbench showed little change as CPUs/Cores were added, which is what we expected. However, the Geekbench Stream test, which measures memory bandwidth, showed a noticeable decline as we added CPUs/Cores to the mix. We saw the best Stream result with just a single CPU/core.
Our assumption is that the additional overhead of the virtual environment to use additional CPUs/Cores is what ate into the stream bandwidth performance. Even so, the improvement in the Integer and Floating Point tests with multiple CPUs/Cores is probably well worth the slight drop in Stream performance for most users.
Our CINEBENCH results also showed just about what we expected. Rendering, which uses the CPU to draw a complex image, improved as more CPUs/Cores were added to the mix. The OpenGL test uses the graphics card, so there were no noticeable changes as we added CPUs/Cores.
Optimize Parallels Desktop - 1 GB RAM vs. Multiple CPUs/Cores
We'll start this benchmark by assigning 1 GB of RAM to the Windows 7 guest OS. This is the recommended memory allocation for Windows 7 (64-bit), at least according to Parallels. We thought it was a good idea to test with this memory level, because it's likely to be the option for many users.
After setting the 1 GB RAM allotment, we ran each of our benchmarks using 1 CPU/Core. After the benchmarks were complete, we repeated the test using 2 and then 4 CPUs/Cores.
1 GB Memory Results
What we found was pretty much what we expected; Windows 7 was able to perform well, even though memory was below the recommend level. In the Geekbench Overall, Integer, and Floating Point tests, we saw performance improve nicely as we threw additional CPUs/Cores at the tests. We saw the best scores when we made 4 CPUs/Cores available to Windows 7. The memory portion of Geekbench showed little change as we added CPUs/Cores, which is what we expected. However, the Geekbench Stream test, which measures memory bandwidth, showed a noticeable decline as we added CPUs/Cores to the mix. We saw the best Stream result with just a single CPU/core.
Our assumption is that the additional overhead of the virtual environment to use additional CPUs/Cores is what ate into the stream bandwidth performance. Even so, the improvement in the Integer and Floating Point tests with multiple CPUs/Cores is probably well worth the slight drop in Stream performance for most users.
Our CINEBENCH results also showed just about what we expected. Rendering, which uses the CPU to draw a complex image, improved as more CPUs/Cores were added to the mix. The OpenGL test uses the graphics card, so there were no noticeable changes as we added CPUs/Cores.
One thing we noticed right away was that while overall performance numbers in each test were better than the 512 MB configuration, the change was marginal, hardly what we expected. Of course, the benchmark tests themselves aren't very memory-bound to begin with. We expect that real-world applications that do use memory heavily would see a boost from the added RAM.
Optimize Parallels Desktop - 2 GB RAM vs. Multiple CPUs/Cores
We'll start this benchmark by assigning 2 GB of RAM to the Windows 7 guest OS. This is likely to be the upper end of RAM allocation for most individuals who run Windows 7 (64-bit) under Parallels. We anticipate a bit better performance than the 512 MB and 1 GB tests we ran earlier.
After setting the 2 GB RAM allotment, we ran each of our benchmarks using 1 CPU/Core. After the benchmarks were complete, we repeated the tests using 2 and then 4 CPUs/Cores.
2 GB Memory Results
What we found wasn't quite what we expected. Windows 7 performed well, but we didn't expect to see such a small performance increase based on just the amount of RAM. In the Geekbench Overall, Integer, and Floating Point tests we saw performance improve nicely as we threw additional CPUs/Cores at the tests. We saw the best scores when we made 4 CPUs/Cores available to Windows 7. The memory portion of Geekbench showed little change as we added CPUs/Cores, which is what we expected. However, the Geekbench Stream test, which measures memory bandwidth, showed a noticeable decline as we added CPUs/Cores to the mix. We saw the best Stream result with just a single CPU/core.
Our assumption is that the additional overhead of the virtual environment to use additional CPUs/Cores is what ate into the stream bandwidth performance. Even so, the improvement in the Integer and Floating Point tests with multiple CPUs/Cores is probably well worth the slight drop in Stream performance for most users.
Our CINEBENCH results also showed just about what we expected. Rendering, which uses the CPU to draw a complex image, improved as more CPUs/Cores were added to the mix. The OpenGL test uses the graphics card, so there were no noticeable changes as we added CPUs/Cores.
One thing we noticed right away was that while overall performance numbers in each test were better than the 512 MB configuration, the change was marginal, hardly what we expected. Of course, the benchmark tests themselves aren't very memory-bound to begin with. We expect that real-world applications that do use memory heavily would see a boost from the added RAM.
Parallels Memory and CPU Allocation - What We Discovered
After testing Parallels with memory allocations of 512 RAM, 1 GB RAM, and 2 GB RAM, along with testing with multiple CPU/Core configurations, we came to some definite conclusions.
RAM Allocation
For the purposes of benchmark testing, the amount of RAM had little influence on overall performance. Yes, allocating more RAM did generally improve benchmark scores, but not at a substantial enough rate to warrant depriving the host OS (OS X) of RAM that it could put to better use.
Remember, though, that while we didn't see big improvements, we only tested the guest OS using benchmark tools. The actual Windows applications that you use may indeed be able to perform better with more RAM available to them. However, it's also clear that if you use your guest OS to run Outlook, Internet Explorer, or other general applications, you probably won't see any improvement by throwing more RAM at them.
CPUs/Cores
The biggest performance increase came from making additional CPUs/Cores available to the Parallels guest OS. Doubling the number of CPUs/Cores didn't produce a doubling in performance. The best performance increase came in the Integer test, with a 50% to 60% increase when we doubled the number of available CPU/Cores. We saw a 47% to 58% improvement in the Floating Point test when we doubled the CPUs/Cores.
However, because the Overall score includes memory performance, which saw little change, or in the case of Stream test, a decline as CPUs/Cores were increased, the Overall percentage improvement only ranged from 26% to 40%.
The Results
We were looking for two RAM/CPU configurations to use for the rest of our tests, the worst performing and best performing. Remember that when we say 'worst,' we're only referring to performance in the Geekbench benchmark test. The worst performance in this test is actually decent real-world performance, usable for most basic Windows applications, such as email and web browsing.
- Worst: 512 MB RAM and 1 CPU
- Best: 1 GB RAM and 4 CPUs
Parallels Video Performance - Video RAM Size
In this video performance test of Parallels, we're going to use two baseline configurations. The first will be 512 MB of RAM and a single CPU allocated to the Windows 7 guest OS. The second configuration will be 1 GB of RAM and 4 CPUs allocated to the Windows 7 guest OS. For each configuration, we'll change the amount of video memory assigned to the guest OS, to see how it effects performance.
We will use CINEBENCH R11.5 to benchmark graphics performance. CINEBENCH R11.5 runs two tests. The first is OpenGL, which measures the ability of the graphics system to accurately render an animated video. The test requires that each frame be rendered accurately, and measures the overall frame rate achieved. The OpenGL test also requires that the graphics system support hardware-based 3D acceleration. So, we'll always perform the tests with hardware acceleration enabled in Parallels.
The second test involves rendering a static image. This test uses the CPU to render a photorealistic image, using CPU-intensive computations to render reflections, ambient occultation, area lighting and shading, and more.
Expectations
We expect to see some difference in the OpenGL test as we change video RAM size, provided there is enough RAM to allow hardware acceleration to operate. Likewise, we expect the rendering test to be affected mostly by the number of CPUs available to render the photorealistic image, with little effect from the amount of video RAM.
With those assumptions in place, let's see how Parallels 6 Desktop for Mac benchmarks.
Parallels Video Performance Results
We saw little effect on the OpenGL test from changing the number of CPUs/Cores available to the guest OS. We did, however, see a slight falloff (3.2 %) in performance when we lowered the amount of video RAM from 256 MB to 128 MB.
The rendering test responded as expected to the number of CPUs/Cores available; the more the merrier. But we also saw a slight performance dip (1.7 %) when we dropped video RAM from 256 MB to 128 MB. We didn't really expect the video RAM size to have the effect it did. Even though the change was small, it was repeatable and measurable.
Parallels Video Performance Conclusion
Although the actual performance changes between video RAM sizes were marginally different, they were nevertheless measurable. And since there doesn't seem to be an outstanding reason to set video memory below the currently supported maximum size of 256 MB, it seems safe to say that the default 256 MB video RAM setting with 3D hardware acceleration enabled is indeed the best setting to use for any guest OS.
Optimize Parallels Desktop - Best Configuration for Guest OS Performance
With the benchmarks out of the way, we can turn to tuning Parallels 6 Desktop for Mac for the best performance for the guest OS.
Memory Allocation
What we found was that memory allocation had less effect on the performance of the guest OS then we first thought. What this indicates is that Parallels' built-in caching system, which is designed to aid in the base performance of the guest OS, works very well, at least for guest OSes that Parallels knows about. If you choose an unknown guest OS type, then Parallels caching may not work as well.
Therefore, when setting memory allocation for the guest OS, the key to determining the size to use is the applications you will run in the guest OS. You won't see much improvement in basic non-memory-intensive applications, such as email, browsing, and word processing, by lavishing memory on them.
Where you will see benefits from upping the memory allocation is with applications that do use a lot of RAM, such as graphics, games, complex spreadsheets, and multimedia editing.
Our recommended memory allocation then is 1 GB for most guest OSes and the basic applications they will run. Increase that amount for games and graphics, or if you're seeing subpar performance.
CPU/Cores Allocation
By far, this setting has the most effect on guest OS performance. However, as with memory allocation, if the applications you use don't need a lot of performance, you're wasting CPUs/Cores that your Mac could use if you increase the CPU/Core assignment unnecessarily. For basic applications such as email and web browsing, 1 CPU is fine. You'll see improvements in games, graphics, and multimedia with multiple cores. For these types of applications, you should assign at least 2 CPU/Cores, and more, if possible.
Video RAM Settings
This actually turned out to be pretty simple. For any Windows-based guest OS, use the maximum video RAM (256 MB), enable 3D Acceleration, and enable Vertical Synchronization.
Optimization Settings
Set the Performance setting to 'Faster virtual machine.' This will allocate physical memory from your Mac to be dedicated to the guest OS. This can improve guest OS performance, but can also reduce the performance of your Mac if you have limited memory available.
Turning the Enable Adaptive Hypervisor feature on allows the CPUs/Cores on your Mac to be assigned to whichever application is currently in focus. This means that as long as the guest OS is the foremost application, it will have a higher priority over any Mac applications you are running at the same time.
The Tune Windows for Speed option will automatically disable some Windows features that tend to slow down performance. These are mostly visual GUI elements, such as slow fading of windows and other effects.
Set Power to 'Better performance.' This will allow the guest OS to run at full speed, regardless of how that will affect the battery in a portable Mac.
Optimize Parallels Desktop - Best Configuration for Mac Performance
Tuning Parallels' guest OS configuration options for best Mac performance assumes that you have guest OS applications that you wish to leave running at all times, and that you want them to have minimal impact on your use of your Mac. An example would be running Outlook in the guest OS, so you can frequently check your corporate email. You want your Mac applications to continue to run, without any big performance hit from running the virtual machine.
Memory Allocation
Set the guest OS to the minimum memory required for the OS plus the applications you wish to run. For basic Windows applications, such as email and browsers, 512 MB should be sufficient. This will leave more RAM for your Mac applications.
CPUs/Cores Allocation
Because guest OS performance isn't the goal here, setting the guest OS to have access to a single CPU/Core should be adequate to ensure that the guest OS can operate well, and that your Mac isn't unduly burdened.
Video RAM Allocation
Video RAM and its related setting actually have little impact on your Mac's performance. We suggest leaving it at the default setting for the guest OS.
Optimization Settings
Set the Performance setting to 'Faster Mac OS.' This will give preference to allocating physical memory to your Mac instead of dedicating it to the guest OS, and improve your Mac's performance. The downside is that the guest OS could be short on available memory, and perform slowly until your Mac makes memory available to it.
Turn the Enable Adaptive Hypervisor feature on to allow the CPUs/Cores on your Mac to be assigned to whichever application is currently in focus. This means that as long as the guest OS is in the background, it will have a lower priority than any Mac application you're running at the same time. When you switch focus to the guest OS, you will see an increase in performance while you're working with it.
The Tune Windows for Speed feature will automatically disable some Windows features that tend to slow down performance. These are mostly visual GUI elements, such as slow fading of windows and other effects. Overall, the Tune Windows for Speed settings won't have much effect on your Mac's performance, but should give the guest OS a nice boost when you're actively working with it.
Set Power to 'Longer Battery Life' to reduce the performance of the guest OS and extend the battery in a portable Mac. If you're not using a portable Mac, this setting won't really make much difference.
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Feb 15, 2009So i installed windows 7 on my macbook (not aluminum) and when i go to install the boot camp drivers off of the retail leopard CD i get an error that says that I can't because it only installs on vista or XP. My laptop came with Tiger CD's so i can't get them off of there.
Windows On Mac :: Installing Parallels Tools While In Boot Camp Windows 7
Mar 2, 2009I am trying to set up a Parallels 4 VM for a Windows 7 x64 Build 7000 boot camp partition, but parallels tools will not install. Half way through the process, a windows unsigned driver security box pops up, and when I tell it to install anyway, it still rolls back the installation process and I get the message 'An error has occured while installing parallels tools, click OK to restart your computer and try again.' or something to that effect. I have tried this about 15 times, and I have tried uninstalling/deleting the VM and re-creating the VM to no avail.
What I want to know: Is there a way to manually install Parallels Tools while running in the boot camp partition, just like installing any other application? I want to install it outside of Parallels, since for some reason it keeps screwing itself up when trying to set up the drivers as a VM.
Windows On Mac :: Won't Work With Parallels / Windows Vista 64-bit Boot Camp
Apr 10, 2009I was able to get Windows Vista 64 running on my 17' MBP, it is pretty slick. I set aside 32 GB for Windows, ran the install, loaded all the appropriate Boot Camp drivers and everything is working perfectly in Windows. I boot back to OS X to attempt to configure Parallels...
So I fired up Parallels and follow the guided instructions. However, when I get to step 2 Im not sure what I should be doing. I already have Windows on its own partition, but Parallels is asking me for a CD/DVD image. Im a little leery of putting the Win disc back in, I dont want Parallels to always want to boot from the disc. how do I tell Parallels to load Windows as a Virtual Machine off of the Boot Camp partition?
The partition Boot Camp created now appears on my Desktop in OS X as Untitled, I can not, for the life of me, figure out how to change that. If I eject that volume will I still be able to Boot to Windows? Will Parallel still work?
Windows On Mac :: Won't Work With Boot Camp In Windows 7 Build 7077 X64
Parallels On Mac
Apr 16, 2009So I finally got Windows 7 64bit installed on my MBP 2.33 machine.
However, from the guides, I should just insert my leopard disc and it should run. This is the thing, I don't know where my leopard disc is (i've been moving a lot lately due to being unemployed) and its either lost or packed away somewhere. I have a backup copy on my time machine drive and haven't tried that yet. I downloaded a 2.1 extraction and burned it to CD though. I inserted the CD and I can see in windows 7 three applications. One is Windows XP, the others are Windows Vista 32 and Windows Vista 64. I click the Vista 64, but nothing happens at all, and no drivers are isntalled.
Parallels For Mac Support
Windows On Mac :: VMware Slowing Down Windows 7 Start Up Through Boot Camp?
Jul 16, 2009im using boot camp for windows 7 and recently started to use vmware and ever since then the start up time is horribly long when before it was very fast. it takes a long time to get to the log in screen and then when i get to the desktop it stays black for a while longer. its not the worst thing in the world and a small price to pay to be able to run my boot camp partition alongside os x but i just want to make sure vmware is the culprit because if it isn't i might need to do some more digging to find the real problem.
btw im talking about starting windows through boot camp not through vmware.