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1,115
Posted By sant
blackrageous, you answers in correct direction,...
blackrageous, you answers in correct direction, thanks.
by near and far memory I mean numa. We can skip this, let's say just RAM.

cpu time is based on state, yes, and this is the question - what...
1,115
Posted By sant
Cpu time
Hi Experts,

If a thread running on CPU needs some data from RAM (from near or far RAM) it requests the data (this moment of time is t0) and gets it in moment of time in t1, and continues his work....
2,135
Posted By sant
How raw disks are read?
Hi Experts,

If I understand correctly in posix standard system calls read/write or pread/pwrite a file descriptor should be sent.
How it works in case of raw disk? Are there something like files...
1,327
Posted By sant
[Linux] How much time a process waited for CPU?
Hi,

Is it possible in Linux to find out how much time a process waited for CPU?
In Solaris we can see it in prstat.

Thanks
3,315
Posted By sant
It is interesting. What if I have 50 processes...
It is interesting.
What if I have 50 processes on the host with 100 CPU cores. And let's suggest in some moment of time ALL of them are entering in some CPU expensive syscall. As an example syscall...
3,315
Posted By sant
Let's suggest that we do physical read involving...
Let's suggest that we do physical read involving OS cache.
Also suggest that our cache is huge and CPU and disk are very slow that searhcing in cache consumes about 5 seconds and after that request...
3,315
Posted By sant
I would expect that process state will be on CPU...
I would expect that process state will be on CPU in that moment instead of sleeping.
3,315
Posted By sant
Thank you Jim for your answer. However I am...
Thank you Jim for your answer.
However I am confused.

Could you please review this thread and give your comment?...
3,315
Posted By sant
Process on CPU inside syscall
Hello Experts,

If a Solaris process is calling some syscall, and right now execution is inside syscall doing only CPU work, for example the inside simplest times syscall,

-> app_func
=>...
4,831
Posted By sant
I expected exactly this answer. Thank you, Jim.
I expected exactly this answer.
Thank you, Jim.
4,831
Posted By sant
idle% cpu and run queue
Hi Everybody,

Can anybody explain how CPU idle% is about 50%, but runq-sz more than 1?
sar from Solaris 10:

00:00:05 %usr %sys %wio %idle
17:00:08 27 12 0 61...
3,352
Posted By sant
The 2nd column (b). So, if a process is in...
The 2nd column (b).

So, if a process is in syscall, it will be blocked and present in the column b?
3,352
Posted By sant
Blocked process and preempt
Hello Everyone,

There is a column kthr:b in vmstat. How a process become blocked?
If the process calls system call pread and sleeps inside it, is the process blocked in that moment?
How a...
2,315
Posted By sant
Guys, thanks for your valuable comments. ...
Guys, thanks for your valuable comments.

Could you please also comment:
1) If soft does NOT feet all available RAM - should swap be free or not?
As I understood - not, because it should solve...
2,315
Posted By sant
Guys, Thanks for your comments. If you...
Guys,
Thanks for your comments.

If you have Oracle, buy enough memory so that it should never swap

1) Does this mean that OS will not do unnecessary paging in background?

2) Does this...
2,315
Posted By sant
[duplicate]
[duplicate]
2,315
Posted By sant
Corona688, thank you for your comment. Could...
Corona688, thank you for your comment.

Could you please be more specific about operating systems?
I mean Solaris, Linux. Is swap must be on these platforms?

Why without swap I may run out of...
2,315
Posted By sant
Please advise good source of info about swapping
Hi Everyone,

I have some misunderstanding about swapping.

Is it true that swap
a) required always (I mean I cannot set size 0 bytes)
and
b) some pages are saved on disk in idle time even...
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