'Resource temporarily unavailable' during stress testing

[CaledoniaProject]

Hmm, this module cannot bear stress testing,

Any suggestions?

What I did:

for x in {1..10000}; do curl XXX/leveldb.php & done

Stack trace:

0 /home/nginx/nginx/html/leveldb.php(7): LevelDB->__construct('/home/leveldb/', NULL, NULL, NULL)

1 {main}

thrown in /home/nginx/nginx/html/leveldb.php on line 7

Fatal error: Uncaught exception 'LevelDBException' with message 'IO error: lock /home/leveldb//LOCK: Resource temporarily unavailable'

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Here's the source code I'm using:

<?php if (! isset ($_POST['key']) || ! isset ($_POST['value'])) { die ("Missing post args key and value"); }

$db = new LevelDB("/home/leveldb/", $options, $readoptions, $writeoptions); $db->put ($_POST[key], $_POST[value]); ?>

[reeze]

This might be a known limitation of leveldb by design, it designed to be thread-safety but not mulit-process safety, I guess you use php-fpm, it is a multi-process model.

So it didn't work well at hight concurrency, if you want you could try to catch the exception and try to open it again.