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Commit60cfe25

Browse files
committed
Adjust spawn_process() to avoid unnecessary overhead processes: we can
just exec instead of creating a subprocess. This reduces process usagefrom four processes per parallel test to two. I have no idea whethera comparable optimization is possible or useful in the Windows port.
1 parent87c3129 commit60cfe25

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3 files changed

+28
-23
lines changed

3 files changed

+28
-23
lines changed

‎doc/src/sgml/regress.sgml‎

Lines changed: 4 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/regress.sgml,v 1.53 2006/07/19 02:37:00 tgl Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/regress.sgml,v 1.54 2006/07/1917:02:59 tgl Exp $ -->
22

33
<chapter id="regress">
44
<title id="regress-title">Regression Tests</title>
@@ -96,11 +96,10 @@ gmake check
9696
<para>
9797
The parallel regression test starts quite a few processes under your
9898
user ID. Presently, the maximum concurrency is twenty parallel test
99-
scripts, which means sixty processes: there's a server process, a
100-
<application>psql</>, and usually a shell parent process for the
101-
<application>psql</> for each test script.
99+
scripts, which means forty processes: there's a server process and a
100+
<application>psql</> process for each test script.
102101
So if your system enforces a per-user limit on the number of processes,
103-
make sure this limit is at leastseventy-five or so, else you may get
102+
make sure this limit is at leastfifty or so, else you may get
104103
random-seeming failures in the parallel test. If you are not in
105104
a position to raise the limit, you can cut down the degree of parallelism
106105
by setting the <literal>MAX_CONNECTIONS</> parameter. For example,

‎src/test/regress/GNUmakefile‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
# Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
77
# Portions Copyright (c) 1994, Regents of the University of California
88
#
9-
# $PostgreSQL: pgsql/src/test/regress/GNUmakefile,v 1.59 2006/07/1904:02:31 tgl Exp $
9+
# $PostgreSQL: pgsql/src/test/regress/GNUmakefile,v 1.60 2006/07/1917:02:59 tgl Exp $
1010
#
1111
#-------------------------------------------------------------------------
1212

@@ -39,7 +39,8 @@ EXTRADEFS = '-DPGBINDIR="$(bindir)"' \
3939
'-DLIBDIR="$(libdir)"'\
4040
'-DPGSHAREDIR="$(datadir)"'\
4141
'-DHOST_TUPLE="$(host_tuple)"'\
42-
'-DMAKEPROG="$(MAKE)"'
42+
'-DMAKEPROG="$(MAKE)"'\
43+
'-DSHELLPROG="$(SHELL)"'
4344

4445
##
4546
## Prepare for tests

‎src/test/regress/pg_regress.c‎

Lines changed: 21 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@
1111
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
1212
* Portions Copyright (c) 1994, Regents of the University of California
1313
*
14-
* $PostgreSQL: pgsql/src/test/regress/pg_regress.c,v 1.4 2006/07/1916:23:17 tgl Exp $
14+
* $PostgreSQL: pgsql/src/test/regress/pg_regress.c,v 1.5 2006/07/1917:02:59 tgl Exp $
1515
*
1616
*-------------------------------------------------------------------------
1717
*/
@@ -60,6 +60,7 @@ static char *libdir = LIBDIR;
6060
staticchar*datadir=PGSHAREDIR;
6161
staticchar*host_platform=HOST_TUPLE;
6262
staticchar*makeprog=MAKEPROG;
63+
staticchar*shellprog=SHELLPROG;
6364

6465
/* currently we can use the same diff switches on all platforms */
6566
staticconstchar*basic_diff_opts="-w";
@@ -630,8 +631,20 @@ spawn_process(const char *cmdline)
630631
}
631632
if (pid==0)
632633
{
633-
/* In child */
634-
exit(system(cmdline) ?1 :0);
634+
/*
635+
* In child
636+
*
637+
* Instead of using system(), exec the shell directly, and tell it
638+
* to "exec" the command too. This saves two useless processes
639+
* per parallel test case.
640+
*/
641+
char*cmdline2=malloc(strlen(cmdline)+6);
642+
643+
sprintf(cmdline2,"exec %s",cmdline);
644+
execl(shellprog,shellprog,"-c",cmdline2,NULL);
645+
fprintf(stderr,_("%s: could not exec \"%s\": %s\n"),
646+
progname,shellprog,strerror(errno));
647+
exit(1);/* not exit_nicely here... */
635648
}
636649
/* in parent */
637650
returnpid;
@@ -648,7 +661,7 @@ spawn_process(const char *cmdline)
648661

649662
if (!CreateProcess(NULL,cmdline2,NULL,NULL, FALSE,0,NULL,NULL,&si,&pi))
650663
{
651-
fprintf(stderr,_("failed to start process for \"%s\": %lu\n"),
664+
fprintf(stderr,_("could not start process for \"%s\": %lu\n"),
652665
cmdline2,GetLastError());
653666
exit_nicely(2);
654667
}
@@ -684,7 +697,7 @@ psql_start_test(const char *testname)
684697

685698
if (pid==INVALID_PID)
686699
{
687-
fprintf(stderr,_("failed to start process for test %s\n"),
700+
fprintf(stderr,_("could not start process for test %s\n"),
688701
testname);
689702
exit_nicely(2);
690703
}
@@ -918,7 +931,7 @@ wait_for_tests(PID_TYPE *pids, int num_tests)
918931

919932
if (p==-1)
920933
{
921-
fprintf(stderr,_("failed to wait(): %s\n"),strerror(errno));
934+
fprintf(stderr,_("could not wait(): %s\n"),strerror(errno));
922935
exit_nicely(2);
923936
}
924937
for (i=0;i<num_tests;i++)
@@ -938,7 +951,7 @@ wait_for_tests(PID_TYPE *pids, int num_tests)
938951
r=WaitForMultipleObjects(num_tests,pids, TRUE,INFINITE);
939952
if (r!=WAIT_OBJECT_0)
940953
{
941-
fprintf(stderr,_("failed to wait for commands to finish: %lu\n"),
954+
fprintf(stderr,_("could not wait for commands to finish: %lu\n"),
942955
GetLastError());
943956
exit_nicely(2);
944957
}
@@ -1228,7 +1241,7 @@ main(int argc, char *argv[])
12281241
intc;
12291242
inti;
12301243
intoption_index;
1231-
charbuf[MAXPGPATH];
1244+
charbuf[MAXPGPATH*4];
12321245

12331246
staticstructoptionlong_options[]= {
12341247
{"help",no_argument,NULL,'h'},
@@ -1431,14 +1444,6 @@ main(int argc, char *argv[])
14311444
exit_nicely(2);
14321445
}
14331446

1434-
/*
1435-
* XXX Note that because we use system() to launch the subprocess,
1436-
* the returned postmaster_pid is not really the PID of the
1437-
* postmaster itself; on most systems it'll be the PID of a parent
1438-
* shell process. This is OK for the limited purposes we currently
1439-
* use postmaster_pid for, but beware!
1440-
*/
1441-
14421447
/*
14431448
* Wait till postmaster is able to accept connections (normally only
14441449
* a second or so, but Cygwin is reportedly *much* slower). Don't

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