You might have noticed it from your own memCron graphs, if not, check the demo out. I believe DreamHost is rolling out a new update that gives extra swap memory to your PS server. This is the reason why you see the jump right after memCron changes your memory setting, signifying more memory is available than what memCron expects.
While memCron might act a little weird because of this change, the good news is if this change is permanent, memCron can operate at a lower margin, and you will be able to save even more money with it! 
I will update memCron to adapt to the new memory settings as soon as the memory change is confirmed by DreamHost. I might even release a quick fix at the mean time, once I find the time to do it.
BTW, I also notice you can now create a root user for your PS via DreamHost panel.
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Dreamhost recently posted on their blog: http://blog.dreamhost.com/2009/07/31/the-july-mini-roundup/
They mention the root access, but no mention of changes to memory &/or swap memory.
I hope they let us know soon. I can’t live with out my memCron
The memory show in Memcron is not sync with the actual size of the server, so it’s not change as it should be. is this the issue or it’s my server problem?
I’m seeing the same issue as Itai. Any ideas?
I wonder if it’s not that it’s now reporting swap space as actual available memory, making everything just appear to be 450MB larger than it should be.
Yaosan,
The demo seems to have leveled off at 150Mb. Did you fix memCron or did you disable memCron and force the memory to stay at 150Mb via the DH panel?
Yes I fixed memCron to account for the increase of swap memory and I’m doing some testing with it. So far there hasn’t been a spike big enough to trigger the memory change so I’m not exactly sure if it is working properly.
I’ll probably just go ahead and release the patch and get feedback from users who use a lot of memory on their servers.
I can confirm this changes. They seem to add twice the physical memory as swap, with a 900 MB upper limit for swap.
Hi Robert, thanks for confirming the upper swap memory limit of 900MB, that’s what I would have guessed.
Yaosan,
Thanks for the work you put into this! Could we get a public copy of the changes you made and are testing with? I’ll gladly test it and report back. Thanks!
I would also be willing to beta test this for you Yaosan.
DreamHost hasn’t announced anything about the change to swap memory yet.
I noticed in the memcron code that there are several places where the swap size is calculated. It might be a good idea to move all of that to one function.
I’ve tried to make the calculation as modular as possible starting from version 0.4. I believe there won’t be much benefit to make it any simpler, you sure you aren’t looking at older code? Anyway, thanks for the suggestion.
I’ve released a new version of memCron to address the recent swap memory change. Please give it a try and let me know if there’s any issue.
I currently use memcron for my PS server – ps4815 .
How can I also use memcron for my PS SQL – psmysql12794?
How to setup for the PS SQL and PS server at same time in Crton job?