[haiku-bugs] Re: [Haiku] #8007: [app_server] fully unresponsive when resizing window of big textfile
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Sat, 06 Oct 2012 11:03:55 -0000
#8007: [app_server] fully unresponsive when resizing window of big textfile
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Reporter: ttcoder | Owner: axeld
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: System/Kernel | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking: 7882, 8136
Has a Patch: 1 | Platform: All
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Comment (by bonefish):
jua, thanks for the new patch. Regarding the performance tests, not
knowing what they test exactly I cannot say how meaningful the results
are. From a quick look at
[http://reference.kfupm.edu.sa/content/s/p/the_splash_2_programs__characterization__57664.pdf
this paper] the focus is definitely not on testing locking primitives.
Testing userland locking primitives wouldn't be that interesting anyway,
since the syscall overhead outweighs lengthened code paths in the kernel
by far.
A helpful performance test would cause a lot of locking in the kernel.
Instead of devising a test specifically for that purpose, I'd first try
something simple like building a Haiku image with multiple jobs on an SMP
machine (ideally 8 jobs on 8 logical CPUs). From my experience this causes
quite a bit of lock contention in the VFS and VM subsystems already. It's
also a real world test with practical relevance.
--
Ticket URL: <http://dev.haiku-os.org/ticket/8007#comment:64>
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