From: ron minnich <rminnich@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: [9fans] too many system calls.
Date: Fri, 3 Sep 2010 22:14:35 -0700 [thread overview]
Message-ID: <AANLkTikCR73ntargNqsF9eMXOLXN5+vLS-rG=Qq0+bx4@mail.gmail.com> (raw)
Glibc /bin/date on Linux runs around 140 system calls. A quick pass
with ratrace shows that plan 9 /bin/date has 10.
The conclusion is clear: plan 9 date has way too much overhead. It's
1/14 the number of system calls of Glibc; why's it so big?
A quick pass on getpid() fixes the problem:
#include <u.h>
#include <libc.h>
#include <tos.h>
int
getpid(void)
{
return _tos->pid;
}
Now we're down to seven system calls. 1/20 of glibc. Much better! :-)
ron
next reply other threads:[~2010-09-04 5:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-04 5:14 ron minnich [this message]
2010-09-04 7:58 ` Akshat Kumar
2010-09-04 12:48 ` erik quanstrom
2010-09-04 16:34 ` ron minnich
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