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Performance analysis for exceptions in PHP (1)
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| # All tests running inside a loop of 10 million iterations | |
| # lets first try to add some code for reference. Here we are just creating a standard class | |
| $ time cat <<EOF | php | |
| <?php | |
| for (\$i = 0; \$i < 10000000; ++\$i) { | |
| \$c = new StdClass(); | |
| \$c->var = \$i; | |
| rand(\$i, \$i + 1000000); | |
| } | |
| EOF | |
| real 0m1,011s | |
| user 0m1,004s | |
| sys 0m0,013s | |
| # now, let's see if we try catching an exception here | |
| $ time cat <<EOF | php | |
| <?php | |
| for (\$i = 0; \$i < 10000000; ++\$i) { | |
| try { | |
| \$c = new StdClass(); | |
| \$c->var = \$i; | |
| rand(\$i, \$i + 1000000); | |
| } catch (Exception \$e) { | |
| } | |
| } | |
| EOF | |
| real 0m1,072s | |
| user 0m1,060s | |
| sys 0m0,016s | |
| # Surprise! No extra time detected for running inside a try/catch block. | |
| # Let's discard PHP is not actually optimizing this by throwing a exception there. | |
| $ time cat <<EOF | php | |
| <?php | |
| for (\$i = 0; \$i < 10000000; ++\$i) { | |
| try { | |
| \$c = new StdClass(); | |
| \$c->var = \$i; | |
| if (rand(\$i, \$i + 10000000) === \$i) { | |
| throw new Exception('oops'); | |
| } | |
| } catch (Exception \$e) { | |
| echo 'Random exception catched.' . PHP_EOL; | |
| } | |
| } | |
| EOF | |
| Random exception catched. | |
| real 0m1,099s | |
| user 0m1,083s | |
| sys 0m0,022s | |
| # No significant time added, so adding a catch block does not affect performance. | |
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