[Mono-bugs] [Bug 620404] New: PFX doesn't work correctly

[bugzilla_noreply at novell.com]

http://bugzilla.novell.com/show_bug.cgi?id=620404

http://bugzilla.novell.com/show_bug.cgi?id=620404#c0


           Summary: PFX doesn't work correctly
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.6.x
          Platform: x86-64
        OS/Version: RHEL 5
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: Yury at serdyuk.botik.ru
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


PFX still works incorrectly: when needed to launch N 
threads, it launches N + 1 threads.

The code is:


>> using System;
>> using System.Threading;
>>
>> public class Test_PFX_For {
>>  public static void Main ( String[] args ) {
>>   int num_threads = Convert.ToInt32 ( args [ 0 ] );
>>   Parallel.For ( 0, num_threads, i =>
>>   {
>>    long k = 0;
>>    while ( true ){
>>     k++;
>>     k--;
>>    }
>>   });
>>  }
>> }


For example, starting the program as


>> $ mono Test_PFX_For.exe 1


gives the workload


>> top - 13:54:11 up 7 days,  1:00,  2 users,  load average: 0.44, 0.10, 0.03
>> Tasks: 185 total,   2 running, 182 sleeping,   0 stopped,   1 zombie
>> Cpu0  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu1  :  0.0%us,  0.3%sy,  0.0%ni, 99.3%id,  0.3%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu2  :100.0%us,  0.0%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu3  :100.0%us,  0.0%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu4  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu5  :  0.0%us,  0.0%sy,  0.0%ni, 99.3%id,  0.0%wa,  0.0%hi,  
>> 0.7%si,  0.0%st
>> Cpu6  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu7  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Mem:   8180840k total,  1957368k used,  6223472k free,   200808k buffers
>> Swap:  2096472k total,        0k used,  2096472k free,  1518724k cached
>>
>>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>> 28233 xxx   25   0 3457m 6644 3880 R 200.1  0.1   0:28.23 mono


Starting the program as


>> $ mono Test_PFX_For.exe 2


gives


>> top - 13:56:23 up 7 days,  1:03,  2 users,  load average: 2.19, 0.89, 0.33
>> Tasks: 185 total,   2 running, 182 sleeping,   0 stopped,   1 zombie
>> Cpu0  :  0.0%us,  0.3%sy,  0.0%ni, 93.0%id,  6.7%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu1  :100.0%us,  0.0%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu2  :100.0%us,  0.0%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu3  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu4  :  0.3%us,  0.3%sy,  0.0%ni, 99.3%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu5  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu6  :  0.0%us,  0.3%sy,  0.0%ni, 99.7%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Cpu7  :100.0%us,  0.0%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Mem:   8180840k total,  1956260k used,  6224580k free,   200808k buffers
>> Swap:  2096472k total,        0k used,  2096472k free,  1518736k cached
>>
>>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>> 28502 xxx   25   0 3457m 6556 3876 R 299.7  0.1   1:02.78 mono


and so on.

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