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9b49ec0
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pg_optimizations
pg_optimizations.py
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Benjamin Renard
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9b49ec0
at 2015-11-20 10:29:34
pg_optimizations.py
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#!/usr/bin/python import subprocess p = subprocess.Popen(['getconf','PAGE_SIZE'], stdout=subprocess.PIPE, stderr=subprocess.PIPE) out, err = p.communicate() page_size=int(out.strip()) p = subprocess.Popen(['getconf','_PHYS_PAGES'], stdout=subprocess.PIPE, stderr=subprocess.PIPE) out, err = p.communicate() phys_pages=int(out.strip()) all_mem=phys_pages*page_size def pretty_size(size): size=float(size) for x in ['B', 'KB', 'MB']: if size < 1024.0: return "%i%s" % (size, x) size /= 1024.0 return "%i%s" % (size*1024, x) print "Total server memory : %s (Pages : %s / Page size : %sB" % (pretty_size(all_mem),phys_pages,page_size) pg_ratio=None while pg_ratio is None: pg_ratio=int(raw_input("How many for PG (0-95) ? ")) if pg_ratio<1 or pg_ratio>95: print "Invalid value" pg_ratio=None print "Memory allocated to PG : %s" % pretty_size(all_mem*pg_ratio/100) pg_max_con=None while pg_max_con is None: pg_max_con=int(raw_input("How many simultaneous connections to PG ? ")) if pg_max_con<=0: print "Invalid value" pg_max_con=None shmall=int((phys_pages*pg_ratio/100)*1.2) if shmall>all_mem: shmall=all_mem shmmax=int(shmall*page_size) print "\nTo put in /etc/sysctl.d/30-postgresql-shm.conf :\n" print "\tkernel.shmall = %s" % shmall print "\tkernel.shmmax = %s" % shmmax print "\nAnd restart procps service to apply (on Debian) :\n\n\tservice procps restart" pg_mem=int(all_mem*pg_ratio/100) shared_buffers=int(pg_mem/4) work_mem=int(pg_mem / (pg_max_con + (pg_max_con * 0.1))) effective_cache_size=pg_mem maintenance_work_mem=0.9*pg_mem print "\nTo put in postgresql.conf :\n" print "\t# Memory related parameters" print "\t# PG allocated memory : %s" % pretty_size(pg_mem) print "\tmax_connections = %s" % pg_max_con print "\t# shared_buffers = 25% of PG allocated memory" print "\tshared_buffers = %s" % pretty_size(shared_buffers) print "\t# Memory used for sorting result for each connection" print "\t# work_mem = PG allocated memory / (max_connexions + 10%)" print "\twork_mem = %s" % pretty_size(work_mem) print "\t# Memory used for vacuum, create index, ..." print "\t# maintenance_work_mem = 90% of PG allocated memory" print "\tmaintenance_work_mem = %s " % pretty_size(maintenance_work_mem) print "\t# Available memory for PG (use for internal calculation)" print "\teffective_cache_size = %s" % pretty_size(effective_cache_size) print "\n\t# Checkpoints management" print "\tcheckpoint_segments = 8" print "\tcheckpoint_timeout = 5min" print "\tcheckpoint_completion_target = 0.7" print "\n\t# Log all request > 1sec" print "\tlog_min_duration_statement = 1000" print "\nAnd restart PG service to apply :\n\n\tservice postgresql restart"