Date: Mon, 15 Mar 1999 15:08:22 -0500 (EST) From: shalunov@lynxhub.lz.att.com To: FreeBSD-gnats-submit@freebsd.org Subject: bin/10604: [PATCH] `md5 -t' too fast on modern CPUs Message-ID: <199903152008.PAA21615@tuzik.lz.att.com>
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>Number: 10604
>Category: bin
>Synopsis: [PATCH] `md5 -t' too fast on modern CPUs
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Mar 15 13:10:00 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: stanislav shalunov
>Release: FreeBSD 3.1-RELEASE i386
>Organization:
AT&T
>Environment:
FreeBSD tuzik.lz.att.com 3.1-RELEASE FreeBSD 3.1-RELEASE #0: Wed Mar 10 11:57:33 EST 1999 shalunov@tuzik.lz.att.com:/usr/src/sys/compile/TUZIK i386
>Description:
I am reporting two problems in one report, in fact.
First, `md5 -t' by default digests 1000 1000-byte blocks
and measures time in whole seconds. On any modern CPU
this operation certainly takes much less than 1 second,
thus rendering the option useless. I changed it in such
a way that on my PII 350 it takes about 13-14 seconds.
Second, the message ``Digesting...'' was not flushed, which
made it useless, too (there is no newline in the end of
message).
>How-To-Repeat:
$ md5 -t
>Fix:
Quick fix below:
--- md5.c~ Mon Mar 15 14:55:52 1999
+++ md5.c Mon Mar 15 14:56:23 1999
@@ -34,8 +34,8 @@
/*
* Length of test block, number of test blocks.
*/
-#define TEST_BLOCK_LEN 1000
-#define TEST_BLOCK_COUNT 1000
+#define TEST_BLOCK_LEN 10000
+#define TEST_BLOCK_COUNT 50000
static void MDString PROTO_LIST((char *));
static void MDTimeTrial PROTO_LIST((void));
@@ -120,6 +120,7 @@
printf
("MD5 time trial. Digesting %d %d-byte blocks ...",
TEST_BLOCK_COUNT, TEST_BLOCK_LEN);
+ fflush(stdout);
/* Initialize block */
for (i = 0; i < TEST_BLOCK_LEN; i++)
>Release-Note:
>Audit-Trail:
>Unformatted:
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