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ROFLQuote:
Originally Posted by largon
Mr. SupremeLaw, I investigated using system ram as a ramdisk a while back, (SuperSpeed, Qsoft, Cenatek)
The biggest drawback is enormous cpu usage ~40%-70% depending on setup and overclock
Maybe Nehalem architecture will make it feasible?
You can measure CPU usage with the common throughput HD benchmarking programs, HDTune, HDTach - they give you CPU usage #'s. Of course this usage pattern is STR, not opening an application which takes a fraction of a second. But my point is regular HD and SSD's (both NAND and DRAM) don't act like this.
Also open up task manager when your doing some tests - the CPU usage number is correct, not some artifact. You can verify these yourself by copying some big files, or lots of little ones...
It might have to do with coding, but I can say with certainty the high CPU usage is common to all these kinds of system ramdisks (I tested Qsoft, Superspeed - which is Ramdisk plus that you speak of but I have version 8, not 9, Gavotte, Cenatek...). CPU usage goes down a bit with high overclocks, but not enough to make it worth while. I haven't tested it on a dual socket server mobo, but even a quad@3.6 has this high CPU usage...
higher cpu usage might be related to higher IOPs
SQL with low IOPs disk = low cpu useage
migrated to high IOPs SQL can see much higher CPU useage but much better performance
Might it be much more simple than that?
If you have a processor making a request for data from a hard drive, it has to sit around waiting for the disk to return the data before it can begin processing it. If you have that data in a RAM disk, then the results get returned almost immediately, and processing on the data block can begin immediately. So there is far less System Idle - of course the processor usage is going up because it's not sitting doing nothing just waiting for data to arrive! High processor usage means the thing is actually doing the work you paid for that expensive quad-core to do!
Acard don't support windows boot ...
DAM !
I was hoping to do a 128Go Ram disk for my system !!!
And the whole of my data would be on my Terrabox ( A PC used as a nas and for Torrent downloading ) with my 4 To HDD. ( 2 for moment waiting for the 2 other ^^ )
you mean the super speed ram disk, right? (its software)
the acard ramdisk is a physical piece of hardware that makes ram act like a hdd.
where have you seen that ?Quote:
Originally Posted by madcho
sorry i was thining you talked about acard.Quote:
Originally Posted by lionel57000
I need one :shocked:
:ROTF:Quote:
Originally Posted by madcho
ok
but iodrive will be bootable before the end of the year ...
we have a *very* helpful employee from ACARD, with more details etc etc... http://www.xtremesystems.org/forums/...d.php?t=201723
:up:
Damn you beat me to it. ;)