6 replies to this topic

[julus]

Hi,

Can anybody help me with testing the mmap() performance on Mountain Lion and BSD?
If anybody is willing to do please perform these steps:
1) download c++ script from http://pastebin.com/....php?i=rW9H7XWp (source)
2) compile the script -

g++ mmap_test.cpp.txt

or

clang mmap_test.cpp.txt

3) create testing 1GB file - this take some time

dd if=/dev/urandom of=io_benchmark.dat bs=1000 count=1000000

4) run the test script -

./a.out

5) post the output

I need the output only from OS X 10.8 and BSD systems (solaris was also tested, same results as linux)

current results:

						  OSX10.7   LINUX	
1000 mmaps 4KB blocks:	22483ms	20ms
1000 mmaps 64KB blocks:   22381ms   264ms
1000 mmaps 1024KB blocks: 24862ms  4227ms

The Wine is seriously affected by this OSX bug, most notably SWTOR, but other games too. This bug is responsible for slow loading, or choppy ingame performance.
The test from 10.8 is just to find out, if the issue was fixed. If not, the BSD test will tell us if it will be fixed in short time.

This test does not help anything, it is just for the info

[devilhunter]

julus, on 25 April 2012 - 11:34 PM, said:

Can anybody help me with testing the mmap() performance on Mountain Lion and BSD?

You could ask doh123 for this test, she's currently the only one i know with a 10.8 install.

[doh123]

I know mmap has serious issues.... Kills the possibility of running SWTOR which sucks. I'll try to test this this weekend, but I doubt it's any better in 10.8.

[eisnerguy1]

If you still need help with this, I could give it a shot during the next couple of days.  I've got a Mountain Lion partition.

[julus]

If you want, you can try it. But I doubt it will produce better results. (anything more than 3s is not good result)

[Sanjo]

Is the performance of mmap better on 10.8?

[julus]

not at all :/