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[2019-05-10 07:03 UTC] krakjoe@php.net
-Status: Open
+Status: Not a bug
[2019-05-10 07:03 UTC] krakjoe@php.net
[2019-05-10 07:25 UTC] andrew at nicols dot co dot uk
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Last updated: Sat Apr 27 00:01:30 2024 UTC |
Description: ------------ Once phpdbg_start_oplog() has been called memory usage increases as data is generated, whether or not it is assigned to a variable and garbage collection does not improve this. The below test script demonstrates how the memory usage can grow in a short space of time. The memory increases just from the increment of $i, even if you remove the str_repeat. On a large project, this causes the memory usage to grow as phpunit is run when generating coverage reports, until hitting the memory limit. Test script: --------------- <?php function get_something($repeats) { for ($i = 0; $i < $repeats; $i++) { // Generate a 1MB string. str_repeat(rand(1, 10), 1 * 1024 * 1024); } } function print_memory_usage() { static $memory = null; if (null === $memory) { $memory = memory_get_usage(); } printf("Memory is at %d bytes\n", memory_get_usage() - $memory); } function run($repeats) { print_memory_usage(); for ($i = 0; $i < $repeats; $i++) { get_something($repeats); print_memory_usage(); } print_memory_usage(); gc_collect_cycles(); print_memory_usage(); } $repeats = 50; echo "Running without phpdbg_start_oplog:\n"; run($repeats); echo "Running with phpdbg_start_oplog:\n"; \phpdbg_start_oplog(); run($repeats); Expected result: ---------------- 2005 sm:master> phpdbg -qrr test.php Running without phpdbg_start_oplog: Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Running with phpdbg_start_oplog: Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Actual result: -------------- 2005 sm:master> phpdbg -qrr test.php Running without phpdbg_start_oplog: Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Memory is at 0 bytes Running with phpdbg_start_oplog: Memory is at 65552 bytes Memory is at 65552 bytes Memory is at 65552 bytes Memory is at 131088 bytes Memory is at 131088 bytes Memory is at 196624 bytes Memory is at 196624 bytes Memory is at 196624 bytes Memory is at 262160 bytes Memory is at 262160 bytes Memory is at 327696 bytes Memory is at 327696 bytes Memory is at 393232 bytes Memory is at 393232 bytes Memory is at 393232 bytes Memory is at 458768 bytes Memory is at 458768 bytes Memory is at 524304 bytes Memory is at 524304 bytes Memory is at 524304 bytes Memory is at 589840 bytes Memory is at 589840 bytes Memory is at 655376 bytes Memory is at 655376 bytes Memory is at 720912 bytes Memory is at 720912 bytes Memory is at 720912 bytes Memory is at 786448 bytes Memory is at 786448 bytes Memory is at 851984 bytes Memory is at 851984 bytes Memory is at 917520 bytes Memory is at 917520 bytes Memory is at 917520 bytes Memory is at 983056 bytes Memory is at 983056 bytes Memory is at 1048592 bytes Memory is at 1048592 bytes Memory is at 1048592 bytes Memory is at 1114128 bytes Memory is at 1114128 bytes Memory is at 1179664 bytes Memory is at 1179664 bytes Memory is at 1245200 bytes Memory is at 1245200 bytes Memory is at 1245200 bytes Memory is at 1310736 bytes Memory is at 1310736 bytes Memory is at 1376272 bytes Memory is at 1376272 bytes Memory is at 1376272 bytes Memory is at 1376272 bytes Memory is at 1376272 bytes