Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ihnp4!homxb!mhuxt!mhuxm!mhuxo!ulysses!allegra!mit-eddie!husc6!hao!ames!oliveb!sun!gorodish!guy
From: guy@gorodish.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: Sun Unix `time' command
Keywords: 3.2 vs. 3.4, memory usage
Message-ID: <39812@sun.uucp>
Date: 23 Jan 88 23:16:34 GMT
References: <171@telesoft.UUCP>
Sender: news@sun.uucp
Lines: 30

> In summary, it appears that the memory usage reported by the 3.4 version 
> of `time' is much larger that the amount reported by the 3.2 version for 
> execution of the same program under similar conditions.

...

> 3.2:	0.7u 4.1s 0:06 76% 6+9k 20+1io 0pf+0w
> 3.4:	0.9u 1.6s 0:04 58% 48+72k 35+3io 0pf+0w

> Assuming the method of stat calculation in csh has remained the same between
> releases,

I suspect you'll get many, many mail messages containing completely incorrect
explanations (this *is* USENET, after all), so here's the official scoop:

The method of stat calculation *didn't* remain the same between releases.  From
the SCCS log of "/usr/src/bin/csh/sh.time.c", for a delta applied after the 3.2
release:

	...Also fixed bug in amounts printed when time is set -- now takes
	system page size into account.

You'll note that the numbers in 3.4 are 8 times bigger than the numbers
in 3.2.  Note also that the (software) page size on a VAX is 1KB, while the
page size on a Sun-3 is 8KB.  The 3.2 "csh" used the straight 4.3BSD code,
which "knew" that "pages" and "Kbytes" were the same thing; the 3.4 "csh" had
this bug fixed.
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy@sun.com