comp.os.linux.development.system Google Group

Re: Can extra processing threads help in this case?

2010-03-22T06:51:25Z

your conclusion does not follow.
wether that will help or not depends on the usage pattern of the ram.
if both threads are reading and writing the same areas of ram at
approximately the same time it may help.
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Re: Can extra processing threads help in this case?

2010-03-22T01:51:13Z

Memtest86 is the source of the specifications that I
reported. I summarized the pertinent details.
As far as I can tell if essentially the only thing that is
changed between two machines (regardless of the details of
this change) is much faster RAM and the response time
increases by 800% then this conclusively proves that the app

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Re: Can extra processing threads help in this case?

2010-03-21T19:40:31Z

Such a combination is hard to imagine, and affects the answer you seek.
Documentation, please. Run memtest86+ ([link]) then
report the measured speeds (L1/L2/L3 cache, memory) in MB/s for both
the old and new systems. Name the hardware, chipset, mainboard maker,
RAM make and model. For instance, a very old Dell laptop with 550MHz

Can extra processing threads help in this case?

2010-03-21T17:18:24Z

I have an application that uses enormous amounts of RAM in a
very memory bandwidth intensive way. I recently upgraded my
hardware to a machine with 600% faster RAM and 32-fold more
L3 cache. This L3 cache is also twice as fast as the prior
machines cache. When I benchmarked my application across the

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Re: How to find the kernel patch level that has a specific patch?

2010-03-17T13:06:30Z

[...]
To none. It a Tcl/Tk application, something which is stated in the
third sentence of the corresponding manpage. I am afraid to inform you
that the Google-people who told you that Google invented 'GUI
application programming' in order to sell you into Google-services
have lied to you. As the saying goes: 'there is a sucker born every

Re: How to find the kernel patch level that has a specific patch?

2010-03-16T21:25:37Z

Tilman,
Could you do me a favor by checking what URL your gitk browser
connects to? Maybe `netstat -anp | grep <gikt pid>', or `strace -e
trace=network gitk' can offer a clue. Thank you very much.
Yong Huang

Re: How to study debugger internals

2010-03-13T16:49:28Z

Have you looked at the information at
<[link]> ?
Please be warned that GDB is a pretty large and
complex program,

How to study debugger internals

2010-03-13T15:41:22Z

Excuse me if the post is NOT in scope of the community.
Want to study debuggers internals. Though I understand that they are
very much platform dependent, knowledge of internals for gdb and dbx
(for Intel/ARM) I believe should give me good understanding.
Please help me by telling the best way and if possible few links for

Re: semaphore, task control block, and kernel

2010-03-12T21:04:46Z

Such information does exist but only the kernel needs to know about it.
So it's all stored in the kernel data structures, not in user space.
[...]
Hey, I've been looking into this!
The answer is: it depends. Linux, for example, uses a low-level
lightweight synchronisation primitive called a futex. The glibc pthreads

Re: message passing: blocking non blocking

2010-03-12T20:57:42Z

That is likely incorrect. The correct definition of a blocking send is
"the sending process blocks until the message is 'sent', whatever that
means in context".
No idea, that seems confusing.
The point is this: either the implementation can take the data
immediately (such that the application no longer needs to do anything