Welcome to WebmasterWorld Guest from 126.96.36.199
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Unforunately Dreamhost won't let me edit those settings.
You have a private server and you can't edit the config files? I'd go somewhere else.
I think that PS is actually a virtual server. Likely Virtuozzo powered. They have strict limits on RAM usage.
But if they sold him 1Gb, he should be getting that and that much memory should easily handle his little test.