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Issue #96

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Jean-Marie RENOUARD 2015-07-22 21:21:11 +02:00
parent 7aed5b0ba4
commit 3d0e8579a7
1 changed files with 14 additions and 23 deletions
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37
mysqltuner.pl
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@ -931,27 +931,18 @@ sub calculations {
# Max used memory is memory used by MySQL based on Max_used_connections # Max used memory is memory used by MySQL based on Max_used_connections
# This is the max memory used theorically calculated with the max concurrent connection number reached by mysql # This is the max memory used theorically calculated with the max concurrent connection number reached by mysql
$mycalc{'max_used_memory'} = $mycalc{'server_buffers'} + $mycalc{"max_total_per_thread_buffers"}; $mycalc{'max_used_memory'} = $mycalc{'server_buffers'} + $mycalc{"max_total_per_thread_buffers"};
$mycalc{'pct_max_used_memory'} = percentage($mycalc{'max_used_memory'}, $physical_memory);
# Total possible memory is memory needed by MySQL based on max_connections # Total possible memory is memory needed by MySQL based on max_connections
# This is the max memory MySQL can theorically used if all connections allowed has opened by mysql # This is the max memory MySQL can theorically used if all connections allowed has opened by mysql
$mycalc{'total_possible_used_memory'} = $mycalc{'server_buffers'} + $mycalc{'total_per_thread_buffers'}; $mycalc{'max_peak_memory'} = $mycalc{'server_buffers'} + $mycalc{'total_per_thread_buffers'};
$mycalc{'pct_physical_memory'} = int(($mycalc{'total_possible_used_memory'} * 100) / $physical_memory);
# Maximum memory limit
$mycalc{'max_peak_memory'}=0;
foreach my $key ( 'key_buffer_size', 'query_cache_size', 'tmp_table_size',
'innodb_buffer_pool_size', 'innodb_additional_mem_pool_size',
'innodb_log_buffer_size') {
$mycalc{'max_peak_memory'}+=$myvar{$key} if defined $myvar{$key};
}
foreach my $key ( 'sort_buffer_size', 'read_buffer_size', 'read_rnd_buffer_size', 'join_buffer_size',
'thread_stack', 'binlog_cache_size' ) {
$mycalc{'max_peak_memory'}+=($myvar{$key}*$myvar{'max_connections'}) if defined $myvar{$key};
}
debugprint "Max Peak Memory: ".hr_bytes($mycalc{'max_peak_memory'})."\n";
$mycalc{'pct_max_physical_memory'} = percentage($mycalc{'max_peak_memory'}, $physical_memory); $mycalc{'pct_max_physical_memory'} = percentage($mycalc{'max_peak_memory'}, $physical_memory);
debugprint "Max Percentage RAM: ".$mycalc{'pct_max_physical_memory'}."%\n";
debugprint "Max Used Memory: ".hr_bytes($mycalc{'max_used_memory'})."\n";
debugprint "Max Used Percentage RAM: ".$mycalc{'pct_max_used_memory'}."%\n";
debugprint "Max Peak Memory: ".hr_bytes($mycalc{'max_peak_memory'})."\n";
debugprint "Max Peak Percentage RAM: ".$mycalc{'pct_max_physical_memory'}."%\n";
# Slow queries # Slow queries
$mycalc{'pct_slow_queries'} = int(($mystat{'Slow_queries'}/$mystat{'Questions'}) * 100); $mycalc{'pct_slow_queries'} = int(($mystat{'Slow_queries'}/$mystat{'Questions'}) * 100);
@ -1137,11 +1128,11 @@ sub mysql_stats {
if ($arch && $arch == 32 && $mycalc{'total_possible_used_memory'} > 2*1024*1024*1024) { if ($arch && $arch == 32 && $mycalc{'total_possible_used_memory'} > 2*1024*1024*1024) {
badprint "Allocating > 2GB RAM on 32-bit systems can cause system instability\n"; badprint "Allocating > 2GB RAM on 32-bit systems can cause system instability\n";
badprint "Maximum reached memory usage: ".hr_bytes($mycalc{'total_possible_used_memory'})." ($mycalc{'pct_physical_memory'}% of installed RAM)\n"; badprint "Maximum reached memory usage: ".hr_bytes($mycalc{'max_used_memory'})." ($mycalc{'pct_max_used_memory'}% of installed RAM)\n";
} elsif ($mycalc{'pct_physical_memory'} > 85) { } elsif ($mycalc{'pct_max_used_memory'} > 85) {
badprint "Maximum reached memory usage: ".hr_bytes($mycalc{'total_possible_used_memory'})." ($mycalc{'pct_physical_memory'}% of installed RAM)\n"; badprint "Maximum reached memory usage: ".hr_bytes($mycalc{'max_used_memory'})." ($mycalc{'pct_max_used_memory'}% of installed RAM)\n";
} else { } else {
goodprint "Maximum reached memory usage: ".hr_bytes($mycalc{'total_possible_used_memory'})." ($mycalc{'pct_physical_memory'}% of installed RAM)\n"; goodprint "Maximum reached memory usage: ".hr_bytes($mycalc{'max_used_memory'})." ($mycalc{'pct_max_used_memory'}% of installed RAM)\n";
} }
if ($mycalc{'pct_max_physical_memory'} > 85) { if ($mycalc{'pct_max_physical_memory'} > 85) {
@ -1604,7 +1595,7 @@ sub make_recommendations {
} }
if (@adjvars > 0) { if (@adjvars > 0) {
prettyprint "Variables to adjust:\n"; prettyprint "Variables to adjust:\n";
if ($mycalc{'pct_physical_memory'} > 90) { if ($mycalc{'pct_max_physical_memory'} > 90) {
prettyprint " *** MySQL's maximum memory usage is dangerously high ***\n". prettyprint " *** MySQL's maximum memory usage is dangerously high ***\n".
" *** Add RAM before increasing MySQL buffer variables ***\n"; " *** Add RAM before increasing MySQL buffer variables ***\n";
} }