Thread:Extension talk:SphinxSearch/$wgMaxShellMemory default value too low for SphinxSearch setup.php (MediaWiki 1.19, Sphinx 0.8.5/r115479, Sphinx 2.0.4)

I'm running MediaWiki in a Fedora 16 virtual machine (MediaWiki 1.19, Sphinx 0.8.5/r115479, Sphinx 2.0.4). Thanks for the great extension and documentation. The documentation was clear except for two issues. First, it wasn't clear that php enchant support had to be separately installed (php-enchant package on Fedora). Second, when running  to build the "Did you mean?" suggestion dictionary, the sphinx indexer kept crashing with an odd error: "libgcc_s.so.1 must be installed for pthread_cancel to work". But running the appropriate command  directly worked fine. I saw that ulimit was being used to set resource limits on the shell used to run the indexer in the case of SphinxSearch_setup.php. It turned out that the default value of 102400 KB for the memory limit was too low for an almost-empty (4 documents, 4531 bytes - did I mention it was almost empty) instance of MediaWiki. I don't understand how this could be, so if anyone has ideas please let me know. Setting wgMaxShellMemory to 204800 KB in LocalSettings.php worked.