> later today I will Test with 8 processes instead of 8 threads. That
> way, a process garbage collection won't affect the 7 others. If I'm
> right the processor usage should be 100% on all processors. Let see
done :-)
MultipleReader.cs
--------------
using System;
using System.Diagnostics;
using System.Threading;
namespace MultipleReader
{
class Program
{
static void Main(string[] args)
{
Thread[] Threads = new
Thread[Environment.ProcessorCount];
for (int Idx = 0; Idx < Threads.Length; Idx++)
{
MyThread T = new MyThread(args[0]);
Threads[Idx] = new Thread(new
ThreadStart(T.ThreadEntry));
}
foreach (Thread T in Threads)
T.Start();
foreach (Thread T in Threads)
T.Join();
}
}
class MyThread
{
private string FileName;
public MyThread(string FileName)
{
this.FileName = FileName;
}
public void ThreadEntry()
{
Process myProcess = new Process();
// pe-format installed, no need to call mono directly
myProcess.StartInfo.FileName = "Reader.exe";
myProcess.StartInfo.Arguments = FileName;
myProcess.StartInfo.UseShellExecute = false;
myProcess.Start();
myProcess.WaitForExit();
}
}
}
--------------
Reader.cs
--------------
using System.IO;
namespace Reader
{
class Program
{
static void Main(string[] args)
{
string Str;
using (StreamReader SR = new StreamReader(args[0]))
while ((Str = SR.ReadLine()) != null)
;
}
}
}
--------------
Top output (3 samples)
--------------
top - 09:17:44 up 9 days, 19:30, 4 users, load average: 3.02, 1.92, 1.42
Tasks: 9 total, 8 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 95.5%us, 4.5%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 4002052k total, 2157076k used, 1844976k free, 592k buffers
Swap: 4000176k total, 188k used, 3999988k free, 1390592k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
22745 root 20 0 41700 6480 3152 R 104 0.2 0:16.41
Reader.exe
22749 root 20 0 41700 6480 3148 R 101 0.2 0:17.07
Reader.exe
22746 root 20 0 41700 6488 3152 R 98 0.2 0:16.80
Reader.exe
22750 root 20 0 41700 6492 3152 R 98 0.2 0:16.80
Reader.exe
22751 root 20 0 41700 6484 3152 R 98 0.2 0:17.04
Reader.exe
22752 root 20 0 41700 6492 3152 R 95 0.2 0:16.84
Reader.exe
22747 root 20 0 41700 6496 3152 R 88 0.2 0:16.12
Reader.exe
22748 root 20 0 41700 6496 3152 R 85 0.2 0:16.27
Reader.exe
22733 root 20 0 506m 9108 3556 S 0 0.2 0:00.18
MultipleReader.
top - 09:17:45 up 9 days, 19:30, 4 users, load average: 3.02, 1.92, 1.42
Tasks: 9 total, 8 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 95.1%us, 4.9%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 4002052k total, 2157076k used, 1844976k free, 592k buffers
Swap: 4000176k total, 188k used, 3999988k free, 1390592k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
22750 root 20 0 41700 6484 3152 R 104 0.2 0:17.12
Reader.exe
22746 root 20 0 41700 6480 3152 R 101 0.2 0:17.11
Reader.exe
22752 root 20 0 41700 6484 3152 R 101 0.2 0:17.15
Reader.exe
22745 root 20 0 41700 6492 3152 R 98 0.2 0:16.71
Reader.exe
22749 root 20 0 41700 6492 3148 R 98 0.2 0:17.37
Reader.exe
22751 root 20 0 41700 6496 3152 R 98 0.2 0:17.34
Reader.exe
22748 root 20 0 41700 6484 3152 R 85 0.2 0:16.53
Reader.exe
22747 root 20 0 41700 6492 3152 R 82 0.2 0:16.37
Reader.exe
22733 root 20 0 506m 9108 3556 S 0 0.2 0:00.18
MultipleReader.
top - 09:17:45 up 9 days, 19:30, 4 users, load average: 3.02, 1.92, 1.42
Tasks: 9 total, 8 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 94.7%us, 5.3%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 4002052k total, 2157108k used, 1844944k free, 592k buffers
Swap: 4000176k total, 188k used, 3999988k free, 1390592k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
22745 root 20 0 41700 6492 3152 R 101 0.2 0:17.02
Reader.exe
22751 root 20 0 41700 6504 3152 R 101 0.2 0:17.65
Reader.exe
22746 root 20 0 41700 6492 3152 R 98 0.2 0:17.41
Reader.exe
22747 root 20 0 41700 6488 3152 R 98 0.2 0:16.67
Reader.exe
22750 root 20 0 41700 6496 3152 R 98 0.2 0:17.42
Reader.exe
22752 root 20 0 41700 6496 3152 R 98 0.2 0:17.45
Reader.exe
22749 root 20 0 41700 6496 3148 R 88 0.2 0:17.64
Reader.exe
22748 root 20 0 41700 6488 3152 R 85 0.2 0:16.79
Reader.exe
22733 root 20 0 506m 9108 3556 S 0 0.2 0:00.18
MultipleReader.
--------------
Top is showing some artifacts when is measuring the individual CPU
time (that's normal).
look at the aggregated CPU usage (3rd row on each sample): 0.0%id
Ok, then there is one question left: is there any way to program this
using threads without the GC interfering? any ideas?
Best regards
Yanko
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