[Pharo-project] Design change possible with fast SSD's possible?

Michael Haupt mhaupt at gmail.com
Sat Jan 14 19:51:08 CET 2012


... thanks for the pointer. How about writing speed and modalities?

Am 14.01.2012 um 19:34 schrieb Guido Stepken <gstepken at googlemail.com>:

> Read about "wear leveling"? So, no problem with write cycles. For example yffs2 filesystem gives you a tremendous gain in lifetime of your USB flash storage.
> 
> regards, Guido Stepken
> 
> Am 14.01.2012 15:56 schrieb "Michael Haupt" <mhaupt at gmail.com>:
> Hi,
> 
> 2012/1/14 Janko Mivšek <janko.mivsek at eranova.si>:
> > Conclusion? Why RAM won't be just a L3 cache in a whole hiearchy of
> > caching from SSD up to CPU? Automatic, supported by OS or even hardware,
> > as CPU caches are? Then image wont be needed to be read to RAM and
> > snapshoted back to disk, it can be run directly from disk.
> 
> SSDs are Flash memory. The number of write cycles is limited before
> the memory starts to fail. Smalltalk frequently performs GC, which
> involves moving objects, i.e., writing. Writing is also much slower
> than reading, and AFAIK possible only block-wise (with a block being
> significantly larger than your average object). Flash file systems
> apply optimisations to distribute writing evenly, avoiding excessive
> writing in some places and consequent earlier failure.
> 
> Best,
> 
> Michael
> 
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