On 02/09/16 04:44, Peter Eisentraut wrote:
On 8/1/16 2:17 AM, Gavin Flower wrote:
Possibly look how make does it with the '-l' flag?
'-l 8' don't start more process when load is 8 or greater, works on
Linux at least...
The problem with that approach is that it takes about a minute for the
load averages figures to be updated, by which time you have already
thrashed your system.
You can try this out by building PostgreSQL this way. Please save your
work first, because you might have to hard-reboot your system.
Hmm... I've built several versions of pg this way, without any obvious
problems!
Looking at top, suggests that the load averages never go much above 8,
and are usually less.
This is the bash script I use:
#!/bin/bash
# postgresql-build.sh
VERSION='9.5.0'
TAR_FILE="postgresql-$VERSION.tar.bz2"
echo 'TAR_FILE['$TAR_FILE']'
tar xvf $TAR_FILE
PORT='--with-pgport=5433' ############################ std is 5432
BASE_DIR="postgresql-$VERSION"
echo 'BASE_DIR['$BASE_DIR']'
cd $BASE_DIR
PREFIX="--prefix=/usr/local/lib/postgres-$VERSION"
echo 'PREFIX['$PREFIX']'
LANGUAGES='--with-python'
echo 'LANGUAGES['$LANGUAGES']'
SECURITY='--with-openssl --with-pam --with-ldap'
echo 'PREFIX['$PREFIX']'
XML='--with-libxml --with-libxslt'
echo 'SECURITY['$SECURITY']'
TZDATA='--with-system-tzdata=/usr/share/zoneinfo'
echo 'TZDATA['$TZDATA']'
##DEBUG='--enable-debug'
##echo 'DEBUG['$DEBUG']'
./configure $PREFIX $LANGUAGES $SECURITY $XML $TZDATA $DEBUG
time make -j7 -l8 && time make -j7 -l8 check
Cheers,
Gavin
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