Date: Fri, 7 Apr 2000 06:47:19 -0700
Reply-To: Puddin' Man <pudding_man@ALTAVISTA.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Puddin' Man <pudding_man@ALTAVISTA.COM>
Subject: Fwd: Re: MVS -- U1319, No MKLES
Content-Type: text/plain
On Thu, 06 April 2000, "Paul M. Dorfman" wrote:
>
> Puddin',
>
> Right. But run a second step - after the first - allocating say 100,000
> elements, and I bet you will see a lot of difference.
>
> Cheers,
> Paul
Take a peek, see what you think:
*------------------------------------------------------------------*
*- SAS Version 8.00 Enhanced TS M0 -*
*------------------------------------------------------------------*
NOTE: SAS system options specified are:
SORT=4 FULLSTATS MINSTG
NOTE: The initialization phase used 0.08 CPU seconds and 6068K.
1 data _null_; array a(2000000) _temporary_; run;
NOTE: The DATA statement used the following resources:
Task memory - 4276K (74K data, 4202K program)
Total memory - 22559K (17824K data, 4735K program)
2 data _null_; array a(100000) _temporary_; run;
NOTE: The DATA statement used the following resources:
Task memory - 4192K (74K data, 4118K program)
Total memory - 22475K (17824K data, 4651K program)
3 data _null_; x=1 ; run;
NOTE: The DATA statement used the following resources:
Task memory - 4188K (70K data, 4118K program)
Total memory - 22475K (17824K data, 4651K program)
It appears that the data step grabs "17824K data" and holds
on to it regardless of the needs of subsequent data steps. Eh?
Here's a quick/dirty test with PROC's:
5 data a;
6 do i=1 to 250 by 4;
7 do j=1 to 250 by 4;
8 do k=1 to 250 by 4;
9 x=normal(0);
10 output;
11 end;
12 end;
13 end;
NOTE: The data set WORK.A has 250047 observations and 4 variables.
NOTE: The DATA statement used the following resources:
Task memory - 4272K (70K data, 4202K program)
Total memory - 22583K (17824K data, 4759K program)
14 proc summary nway;
15 class i j k;
16 var x;
17 output out=b;
NOTE: Processing on disk occurred during summarization.
Peak disk usage was approximately 46 Mbytes. Adjusting SUMSIZE may
improve
performance.
NOTE: There were 250047 observations read from the dataset WORK.A.
NOTE: The data set WORK.B has 1250235 observations and 7 variables.
NOTE: The PROCEDURE SUMMARY used the following resources:
Task memory - -16805K (-20660K data, 3855K program)
Total memory - 27997K (23328K data, 4669K program)
18 proc print data=b(obs=20);
3 The SAS Syst
19 ENDSAS;
NOTE: There were 20 observations read from the dataset WORK.B.
NOTE: The PROCEDURE PRINT printed page 1.
NOTE: The PROCEDURE PRINT used the following resources:
Task memory - 4333K (61K data, 4272K program)
Total memory - 22856K (17824K data, 5032K program)
NOTE: The SAS session used 10.35 CPU seconds and 28360K.
Up to "23328K data" then back down to "17824K data". It
doesn't seem to wanna "let loose" the data space
used by the data step.
But it seems to have released some memory used by
PROC SUMMARY. Thats better than nothing ...
Prosit,
Puddin'
"Gimme back my wig
and, honey, let you head go bald!"
- Hound Dog Taylor, maybe 1972
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*** Puddin' Man *** Pudding_Man@altavista.com *****
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