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Parallel threads is parallel proces

Hello all,

On one of our Solaris 5.10 systems we have a database running Oracle
10.2.0.3.
We have parallel_max_servers set to 100.

I was surprised to see that a ps -Lef shows 258 parallel threads per
parallel server process.

See output below.

 ps -ef|grep p00
  oracle 20780     1   0   Sep 02 ?         776:08 ora_p007_P835
  oracle 20776     1   0   Sep 02 ?         525:32 ora_p005_P835
  oracle 20778     1   0   Sep 02 ?         517:40 ora_p006_P835
  oracle 20784     1   0   Sep 02 ?         532:26 ora_p009_P835
  oracle 20782     1   0   Sep 02 ?         531:50 ora_p008_P835
  oracle 20774     1   0   Sep 02 ?         498:28 ora_p004_P835
  oracle 20768     1   0   Sep 02 ?         496:59 ora_p001_P835
  oracle 20770     1   0   Sep 02 ?         495:00 ora_p002_P835
  oracle 20772     1   0   Sep 02 ?         543:02 ora_p003_P835
  oramgr 17883 17839   0 09:03:29 pts/3       0:00 grep p00
  oracle 20766     1   0   Sep 02 ?         586:22 ora_p000_P835


 ps -Lef|grep 20774
  oracle 20774     1     1   258   0   Sep 02 ?         451:42
ora_p004_P835
  oracle 20774     1     2   258   0   Sep 02 ?           0:12
ora_p004_P835
  oracle 20774     1     3   258   0   Sep 02 ?           0:00
ora_p004_P835
  oracle 20774     1     4   258   0   Sep 02 ?           8:55
ora_p004_P835
  oracle 20774     1     5   258   0   Sep 02 ?           0:05
ora_p004_P835
  oracle 20774     1     6   258   0   Sep 02 ?           9:01
ora_p004_P835
  oracle 20774     1     7   258   0   Sep 02 ?           0:05
ora_p004_P835
  oracle 20774     1     8   258   0   Sep 02 ?           8:54
ora_p004_P835
  oracle 20774     1     9   258   0   Sep 02 ?           0:05
ora_p004_P835..
....
rest..........

Does someone know how the parallel threading works?

regards Hans-Peter
0
10/8/2008 7:12:10 AM
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On Oct 8, 12:12=A0am, HansP <hans-peter.sl...@atosorigin.com> wrote:
> Hello all,
>
> On one of our Solaris 5.10 systems we have a database running Oracle
> 10.2.0.3.
> We have parallel_max_servers set to 100.
>
> I was surprised to see that a ps -Lef shows 258 parallel threads per
> parallel server process.
>
> See output below.
>
> =A0ps -ef|grep p00
> =A0 oracle 20780 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 776:08 ora_=
p007_P835
> =A0 oracle 20776 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 525:32 ora_=
p005_P835
> =A0 oracle 20778 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 517:40 ora_=
p006_P835
> =A0 oracle 20784 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 532:26 ora_=
p009_P835
> =A0 oracle 20782 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 531:50 ora_=
p008_P835
> =A0 oracle 20774 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 498:28 ora_=
p004_P835
> =A0 oracle 20768 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 496:59 ora_=
p001_P835
> =A0 oracle 20770 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 495:00 ora_=
p002_P835
> =A0 oracle 20772 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 543:02 ora_=
p003_P835
> =A0 oramgr 17883 17839 =A0 0 09:03:29 pts/3 =A0 =A0 =A0 0:00 grep p00
> =A0 oracle 20766 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 586:22 ora_=
p000_P835
>
> =A0ps -Lef|grep 20774
> =A0 oracle 20774 =A0 =A0 1 =A0 =A0 1 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0 =
=A0 =A0 451:42
> ora_p004_P835
> =A0 oracle 20774 =A0 =A0 1 =A0 =A0 2 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0 =
=A0 =A0 =A0 0:12
> ora_p004_P835
> =A0 oracle 20774 =A0 =A0 1 =A0 =A0 3 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0 =
=A0 =A0 =A0 0:00
> ora_p004_P835
> =A0 oracle 20774 =A0 =A0 1 =A0 =A0 4 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0 =
=A0 =A0 =A0 8:55
> ora_p004_P835
> =A0 oracle 20774 =A0 =A0 1 =A0 =A0 5 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0 =
=A0 =A0 =A0 0:05
> ora_p004_P835
> =A0 oracle 20774 =A0 =A0 1 =A0 =A0 6 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0 =
=A0 =A0 =A0 9:01
> ora_p004_P835
> =A0 oracle 20774 =A0 =A0 1 =A0 =A0 7 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0 =
=A0 =A0 =A0 0:05
> ora_p004_P835
> =A0 oracle 20774 =A0 =A0 1 =A0 =A0 8 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0 =
=A0 =A0 =A0 8:54
> ora_p004_P835
> =A0 oracle 20774 =A0 =A0 1 =A0 =A0 9 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0 =
=A0 =A0 =A0 0:05
> ora_p004_P835..
> ...
> rest..........
>
> Does someone know how the parallel threading works?
>
> regards Hans-Peter

Googling for:
parallel threads oracle doug burns
gives http://www.slideshare.net/dougburns/introduction-to-parallel-executio=
n/
among other things, which supports what you think about
max_parallel_servers.  What you may want to do is look at v$pq_slave
and see if it agrees with what ps is telling you.  It is entirely
possible that ps is showing processes pq is done with, but I'm not on
that sort of configuration so I can't say for sure.  Check out Doug's
site, he's a heckuva helpful guy.

jg
--
@home.com is bogus.
"My house isn't a pigsty, it's an Immunity Enhancement Center. " - The
Real Bev
0
joel-garry (4553)
10/8/2008 6:15:28 PM
On 8 okt, 20:15, joel garry <joel-ga...@home.com> wrote:
> On Oct 8, 12:12=A0am, HansP <hans-peter.sl...@atosorigin.com> wrote:
>
>
>
> > Hello all,
>
> > On one of our Solaris 5.10 systems we have a database running Oracle
> > 10.2.0.3.
> > We have parallel_max_servers set to 100.
>
> > I was surprised to see that a ps -Lef shows 258 parallel threads per
> > parallel server process.
>
> > See output below.
>
> > =A0ps -ef|grep p00
> > =A0 oracle 20780 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 776:08 or=
a_p007_P835
> > =A0 oracle 20776 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 525:32 or=
a_p005_P835
> > =A0 oracle 20778 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 517:40 or=
a_p006_P835
> > =A0 oracle 20784 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 532:26 or=
a_p009_P835
> > =A0 oracle 20782 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 531:50 or=
a_p008_P835
> > =A0 oracle 20774 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 498:28 or=
a_p004_P835
> > =A0 oracle 20768 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 496:59 or=
a_p001_P835
> > =A0 oracle 20770 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 495:00 or=
a_p002_P835
> > =A0 oracle 20772 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 543:02 or=
a_p003_P835
> > =A0 oramgr 17883 17839 =A0 0 09:03:29 pts/3 =A0 =A0 =A0 0:00 grep p00
> > =A0 oracle 20766 =A0 =A0 1 =A0 0 =A0 Sep 02 ? =A0 =A0 =A0 =A0 586:22 or=
a_p000_P835
>
> > =A0ps -Lef|grep 20774
> > =A0 oracle 20774 =A0 =A0 1 =A0 =A0 1 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0=
 =A0 =A0 451:42
> > ora_p004_P835
> > =A0 oracle 20774 =A0 =A0 1 =A0 =A0 2 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0=
 =A0 =A0 =A0 0:12
> > ora_p004_P835
> > =A0 oracle 20774 =A0 =A0 1 =A0 =A0 3 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0=
 =A0 =A0 =A0 0:00
> > ora_p004_P835
> > =A0 oracle 20774 =A0 =A0 1 =A0 =A0 4 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0=
 =A0 =A0 =A0 8:55
> > ora_p004_P835
> > =A0 oracle 20774 =A0 =A0 1 =A0 =A0 5 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0=
 =A0 =A0 =A0 0:05
> > ora_p004_P835
> > =A0 oracle 20774 =A0 =A0 1 =A0 =A0 6 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0=
 =A0 =A0 =A0 9:01
> > ora_p004_P835
> > =A0 oracle 20774 =A0 =A0 1 =A0 =A0 7 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0=
 =A0 =A0 =A0 0:05
> > ora_p004_P835
> > =A0 oracle 20774 =A0 =A0 1 =A0 =A0 8 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0=
 =A0 =A0 =A0 8:54
> > ora_p004_P835
> > =A0 oracle 20774 =A0 =A0 1 =A0 =A0 9 =A0 258 =A0 0 =A0 Sep 02 ? =A0 =A0=
 =A0 =A0 =A0 0:05
> > ora_p004_P835..
> > ...
> > rest..........
>
> > Does someone know how the parallel threading works?
>
> > regards Hans-Peter
>
> Googling for:
> parallel threads oracle doug burns
> giveshttp://www.slideshare.net/dougburns/introduction-to-parallel-executi=
on/
> among other things, which supports what you think about
> max_parallel_servers. =A0What you may want to do is look at v$pq_slave
> and see if it agrees with what ps is telling you. =A0It is entirely
> possible that ps is showing processes pq is done with, but I'm not on
> that sort of configuration so I can't say for sure. =A0Check out Doug's
> site, he's a heckuva helpful guy.
>
> jg
> --
> @home.com is bogus.
> "My house isn't a pigsty, it's an Immunity Enhancement Center. " - The
> Real Bev

Hello Joel,

I think my mail was not clear enough.

My question is about OS multi threading inside a parallel process.
So I have 100 parallel processes with each 258 Os treads.

regards Hans-Peter
0
10/9/2008 6:41:03 AM
Reply:

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About my Parallel compression library and my Parallel archiver...
... Hello, I have downloaded Easy compression library that costs you 149$ and more... Here it is: http://www.componentace.com/ecl_features.htm And i have noticed that it supports three compression algorithms: Zlib, Bzip and PPM, and i have tried to benchmark it against my Parallel compression library and i have found that the Easy compression library with maximum level compression that is ppmMax(with PPM maximum compression level) has less compression ratio than my Parallel compression library with maximum level compression that is clLZMAMax(LZMA with maximum compression level), try it yourself and see, so my Parallel compression library and Parallel archiver are better on compression ratio. If we take a look know at the performance and scalability, my Parallel my Parallel compression library and my Parallel archiver are very fast , you can even use my Parallel archiver as a hashtable from the harddisk with O(1) access, and they can scale with the number of cores, Easy compression library can not. If we take a look at the Relibalitity, my Parallel compression library and my Parallel archiver are very stable now, and they don't take too much memory ressources. If we take a look also at the usability , my Parallel compression library and my Parallel archiver are very easy to use. My Parallel compression library supports Parallel LZMA,Parallel Bzip,Parallel LZ,Parallel LZO and Parallel Gzip compression algorithms, and my...

parallel processors connecting parallel processors
a tiny instruction set, for separating data from function reference(s), ( a representation of a hardware model dichotomization of data and function reference, separate parameter and return stack, ( PATENT PEND., "The Wheel", HoHoHE, :)) explicitly 0< AND XOR DROP OVER DUP @ ! 2* 2/ >R R> INVERT + implicitly JUMP_IF_ZERO JUMP CALL RETURN LITERAL enhanced with a second and third parameter stack, in parallel, for simulating VLIW address protect executable cache. basic machine concept link, enhanced with a second and third parameter stack along the diagonal of the N by...

Parallel DML and parallel clause in 10g R2
Hi, We are getting very weird error and its being shown to Oracle ppl but no success so far. Can any one tell me how to get rid of such issue. We are doing bulk operation on table and for that using "alter session enable parallel DML" but after that if we are doing any bulk insert / update operation on table using aggregate functions its giving different value all the time. i.e. alter session enable parallel DML; insert /*+ append parallel */ into <<table>> select col1, sum(col2), sum(col3) from <<source table>>; commit; Has anyone encountered such issue? ~Pritesh priteshpjani@gmail.com wrote: > Hi, > > We are getting very weird error and its being shown to Oracle ppl but > no success so far. Can any one tell me how to get rid of such issue. > > We are doing bulk operation on table and for that using "alter session > enable parallel DML" but after that if we are doing any bulk insert / > update operation on table using aggregate functions its giving > different value all the time. > > i.e. > > alter session enable parallel DML; > insert /*+ append parallel */ into <<table>> > select col1, sum(col2), sum(col3) > from <<source table>>; > commit; > > Has anyone encountered such issue? > > ~Pritesh What issue? You didn't post any error messages and you didn't post any examples, and even your INSET statement is not your act...

A more scalable Parallel Varfiler and a more scalable Parallel Hashlist
Hello, I have implemented a more scalable Parallel varfiler that uses my scalable RWLock in each bucket of the Parallel hashtable, and it can be used also as a parallel hashtable and that uses ParallelHashList (Parallel Hashtable) with O(1) best case and when there is collisions in the hashtable, the average time complexity will be O(log(n)) in each bucket were the collisions happened. The parallel Hahstable uses lock striping and my scalable RWLock in each bucket , this allows multiple threads to write and read concurently. also ParallelHashList maintains an independant...

A more scalable Parallel Varfiler and a more scalable Parallel Hashlist
Hello, I have implemented a more scalable Parallel varfiler that uses my scalable RWLock in each bucket of the Parallel hashtable, and it can be used also as a parallel hashtable and that uses ParallelHashList (Parallel Hashtable) with O(1) best case and when there is collisions in the hashtable, the average time complexity will be O(log(n)) in each bucket were the collisions happened. The parallel Hahstable uses lock striping and my scalable RWLock in each bucket , this allows multiple threads to write and read concurently. also ParallelHashList maintains an independant...

Parallelization
Hi i have a code which look like this: for i=1:number of particles for j=1:number of time steps {....... .....................} end end i would like to run this code on parallel, but i don't know what will be the best strategy for parallelization. i think that for the outer loop i can use the PARFOR loop since all iteration are independent, but for the inner loop the iteration at step i dependent on the iteration at step i-1. Please if you have any idea it will be helpful thanks best regards Lassoued, If the iterations of the outer for loop are truly order in...

parallel for loops without parallel computing toolbox
Is this possible? On 11-03-07 10:12 AM, Nathan Jensen wrote: > Is this possible? That depends on what you mean by "parallel for loops". Matlab has a published external interface. That interface could be used to call out to arbitrary routines that might _somehow_ do computations in parallel, such as by using OpenMP or POSIX Threads or using an operating-system-specific method. Or you could start multiple Matlab instances and have them communicate with each other somehow, such as via shared memory or TCP; there are a couple of Mathworks File Exchange (FEX) contributions for...

About Parallelism
I have a multi-CPU machine, but I suspect my compilers may not be taking advantage of parallelism. Yes, I am doing penty of multi- threading, but how can I make sure that the implementation is actually making use of the multiple CPU's (Xeons)? As a brute-force approach, I could 'objdump' my pthreads library and study its gas code to see what happens. Is there a less tedious alternative? Thanks, Scott Scott J. McCaughrin wrote: > I have a multi-CPU machine, but I suspect my compilers may not be > taking advantage of parallelism. Yes, I am doing penty...

A more scalable Parallel Varfiler and a more scalable Parallel Hashlist
Hello... I have implemented a more scalable Parallel varfiler that uses my scalable RWLock in each bucket of the Parallel hashtable, and it can be used also as a parallel hashtable and that uses ParallelHashList (Parallel Hashtable) with O(1) best case and when there is collisions in the hashtable, the average time complexity will be O(log(n)) in each bucket were the collisions happened. The parallel Hahstable uses lock striping and my scalable RWLock in each bucket , this allows multiple threads to write and read concurently. also ParallelHashList maintains an independa...

Web resources about - Parallel threads is parallel proces - comp.databases.oracle.server

Parallel - Wikipedia, the free encyclopedia
Text is available under the Creative Commons Attribution-ShareAlike License ;additional terms may apply. By using this site, you agree to the ...

The parallel universe of Donald J. Trump
Within days of the launch of Donald J. Trump's presidential campaign last June, he entered a parallel universe of his unique creation – a universe ...

The parallel universe of Donald J. Trump
Within days of the launch of Donald J. Trump's presidential campaign last June, he entered a parallel universe of his unique creation &ndash; ...

Buy Parallels
Starting today, Parallels is offering a new bundle for a limited time that will let you get 81% off 7 great Mac apps with the purchase or upgrade ...

Explore parallel worlds in Abandoned: The Underground City
... through the scenes, pick up items, and obtain clues. Unlock different locations to explore and search for the secrets behind this hidden, parallel ...


Scandal over South African president draws Nixon parallel
JOHANNESBURG (AP) — Speaking in an old fort and prison from South Africa's era of white domination, a former anti-apartheid leader hinted that ...

Trust and Democracy: The Odd Parallels between Trump and Apple
... Apple in its fight against the FBI and Justice Department wouldn’t be caught dead voting for Trump. And yet Apple’s position has some odd parallels ...

Trade Policy Parallels
It’s not surprising at all, I think. Both Bernie and Trump belong to the rebels, the outsiders. The establishment on both sides is trying to ...

Parallels Updates Remote Application Server for PCs, Macs
Parallels Remote Application Server v15 brings Windows applications and desktops to employees on any device, anywhere in the world.

Resources last updated: 3/19/2016 9:58:47 PM