On 01/09/2013 02:24 PM, Vincent Diepeveen wrote: > > On Jan 9, 2013, at 8:02 PM, Ellis H. Wilson III wrote: >> >> Yea, it's computer science, and I'd love to see you try to toss 16 >> crappy SSDs in a box with a crappy RAID controller and get this easy >> 2.7GB/s random accesses you are touting. Not going to happen. >> > > If you had done effort reading what i wrote - i had said that the
It was commensurate with what you put into the writing process. > random latency is > under 70 us (achieved) at SSD's, so doubting that is kind of > nonsense. it's what you ACHIEVE. Yea. You're right. Constantly spitting crazy nonsense: http://www.cse.psu.edu/~mqj5086/uploads/Main/MJ_PAQ.pdf > You mix that up now as that you can get with random reads a speed of > 2.7 GB/s, No, my assumption is that if the poster says he needs tons of RAM, his application probably has a random-access pattern. You harping on sequential throughput is not constructive to the conversation, unless you have identified the workload for the application is indeed sequential via tracing. > Writes really isn't the problem at hardware that has lots of parallel > channels. They can be easier, as the publication above points out, but they still are bound by the nature of MLC being slower at the device-level for writes than reads. This is particularly for write-in-place and random-writes, which I suspect this workload may have enough of to worry about. > Maybe you should do some effort to read better. You would also have > i started a new subject here. Namely not being busy with 500GB. > > 500GB is total peanuts. Cheapskate oldie 4 socket AMD box with 500GB > and done. > No need to discuss even, as intel is too expensive simply at that > range, not to mention IBM. Oh, sorry, I assumed we were still having a constructive conversation about the posters topic to help him achieve his goal for his application rather than merely thread-stealing and upping the storage size by 10X because "500GB is total peanuts." I'll remember to keep my measuring stick handy next time I think about trying to help somebody build a machine specific to their problem so I don't accidentally stumble into "peanut" territory. Best, ellis _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
