[Mono-bugs] [Bug 402833] New: Slow memory allocation in multi-thread app

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Mon Jun 23 11:34:25 EDT 2008


           Summary: Slow memory allocation in multi-thread app
           Product: Mono: Class Libraries
           Version: 1.9.0
          Platform: x86-64
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: matteo.tesser at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---

Description of Problem:

Allocating memory in a multi-thread application is very expensive when using
mono on mac os x.  The behaviour is very different w.r.t. windows and linux.
I made a small example that simulate a working process that need to allocate
dynamic memory.  First I solve a taks using one thread and then using two
thread. I expected the computation to be solved faster using 2 thread (assuming
the program is running in a multi-core hardware), instead the running time is
10 times the 1 thread code 

Steps to reproduce the problem:
1.  gmcs Main.cs
2.  mono Main.exe

Actual Results:  (runned with mac os)
One Thread time=00:00:00.6118510
Two Thread time=00:00:06.8659580

Expected Results:  (runned with linux)

One Thread time=00:00:00.6511980
Two Thread time=00:00:00.3260190

How often does this happen? 


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