Comments (6)
The old benchmark was done on a Windows 7 machine. It looks like that the SRWLOCK
has improved a lot in Windows 10. I would like to optimize it a little before that.
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Done now: https://github.com/lhmouse/mcfgthread/blob/master/README.md#benchmarking
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Done now: https://github.com/lhmouse/mcfgthread/blob/master/README.md#benchmarking
Does it mean that MCF is even slower than PTHR? What happened when #THRD > 60?
I saw that MCF lock uses spinlock to reduce syscalls. For current benchmark program there is very high possiblity that the program never enters the NtWaitForKeyedEvent syscall.
What if there are more things to do when locking so that the program can hit the NtWaitForKeyedEvent syscall?
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Does it mean that MCF is even slower than PTHR? What happened when #THRD > 60?
I suspect the hash table has been used up. This is practically not a problem, as seldom do people create 60 threads that are all jammed on a single mutex.
I saw that MCF lock uses spinlock to reduce syscalls. For current benchmark program there is very high possiblity that the program never enters the NtWaitForKeyedEvent syscall.
What if there are more things to do when locking so that the program can hit the NtWaitForKeyedEvent syscall?
No, you should run the test yourself; the number of spinning threads is not unlimited. It is possible to
make threads spin infinitely by replacing while(--spin >= 0)
with for(;;)
, however I am sure it will only make your test program run slower, due to increment of bus pressure.
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蛋疼,俩**人还要用英文交流。。。
No, you should run the test yourself; the number of spinning threads is not unlimited. It is possible to
make threads spin infinitely by replacingwhile(--spin >= 0)
withfor(;;)
, however I am sure it will only make your test program run slower, due to increment of bus pressure.
我的意思是现在的benchmark基本上是在测你写的spinlock的速度,跟 NtWaitForKeyedEvent 没啥关系。我想知道 NtWaitForKeyedEvent 和 AcquireSRWLockExclusive 的速度比较
spinlock 总有 hold 不住的情况
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是啊你为什么不自己试一试呢,无脑 spin 跑一分钟都跑不出来结果,就不是几秒钟的事了。无脑 wait 大概会慢一倍。
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Related Issues (20)
- About NtWaitForAlertByThreadId and NtAlertThreadByThreadId HOT 8
- Question about thread.c HOT 5
- Please reconsider implementing the standard memory functions yourself HOT 3
- Clang pre-compiled header causes functions to be not exported from DLL HOT 10
- 关于静态编译的问题 HOT 9
- 用mcf线程模型本地或加拿大编译出来的lld (LLVM的链接器)不能用-flto=thin HOT 2
- License clarification HOT 4
- Make global data shareable between static libraries HOT 1
- Implement inline aliases in a more 'proper' way HOT 4
- Need bench results for condvar HOT 1
- Change log for v1.4
- Function declaration incorrect for c11
- undefined reference to `__MCF_cxa_atexit' HOT 15
- TLS and per-thread exit callbacks should support foreign threads HOT 2
- Link issues using LLVM/Clang built to use GCC's standard libraries HOT 3
- Deadlock in conditional variable? HOT 2
- Blue screen crashes HOT 12
- Use GitHub Actions
- Using MCF thread model with SJLJ exception handling results in infinite recursion HOT 8
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