The problem isn't with the CLI php program (and anyway the CLI php.ini has memory_limit=-1) - it's with the web server processes, and I see the PHP error messages in the apache error logs. But for the life of me, I can't make sense of those. When I had it set to 1G I saw error messages indicating that it had used over 1GB, which is OK. But when I've had it set higher than that, I've seen it fail with error messages which indicate that the effective limit is 160M or 240M - values which I've had set in vhosts BUT NOT the piwik vhost.
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