** Changed in: linux (Ubuntu)
Importance: Medium => Low
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1058864
Title:
Poor mut
I no longer have access to this hardware to get the full computer model,
but the referenced test programs should be able to reproduce the issue
on most, if not all machines (it's worked on everyone I've tried it on
to date).
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Dave Johansen, could you please provide the full computer model as noted
on the sticker (ex. HP Pavilion dm4-2015dx Entertainment Notebook PC)?
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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Bugs, whic
As another data point, I loaded the Ubuntu 8.04-4 x86 LiveCD and rebuilt
the executable and ran the test. I then ran the same executable on the
Ubuntu 7.10 x86 LiveCD and the Ubuntu 12.04 x64 Install (after
installing ia32-libs) and here are the results. I chose those release
because those were the
I installed the kernel with the BFS scheduler from
https://launchpad.net/~chogydan/+archive/ppa and ran the test. It
appears that the the two schedulers count user/system time differently,
but over all it appears that BFS is slightly better than CFS in this
test, but doesn't show any significant im
I also ran it with the 3.6 kernel ( http://kernel.ubuntu.com/~kernel-
ppa/mainline/v3.6-quantal/ ) and just like with 3.4, the performance is
about the same, if not worse.
Here are the results:
mutex
1 thread real 0m 0.545s user 0m 0.520s sys 0m 0.000s
2 threads real 0m 3.550s user 0m 3.636s sy
I'm running 12.04 so I gave the 3.4 kernel a try (
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4-precise/ ). It
appears that the performance is about the same, if not worse, with 3.4.
Here are the results:
mutex
1 thread real 0m 0.515s user 0m 0.508s sys 0m 0.004s
2 threads real 0m 4.305s
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.6 kernel[0] (Not a kernel in the daily directory) and install both
the linux-image and linux-image-extra .deb packages.
Once you've tested the upstrea
apport information
** Tags added: apport-collected precise running-unity staging
** Description changed:
I noticed the results of this blog post:
http://mr-edd.co.uk/blog/sad_state_of_osx_pthread_mutex_t
and I was curious if the same sort of issue existed with the linux kernel and
if it w
