From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 In-Reply-To: <3aaafc130903040852h691b8742t2052e61334c825eb@mail.gmail.com> References: <3aaafc130903032105i742648d2o86ccd2630c4aa61c@mail.gmail.com> <21b55d1c3bb01fa55e90f9400a0cdfb1@quanstro.net> <3aaafc130903040852h691b8742t2052e61334c825eb@mail.gmail.com> Date: Wed, 4 Mar 2009 09:14:35 -0800 Message-ID: <13426df10903040914q5b80031ene90d95d9dd53a19a@mail.gmail.com> From: ron minnich To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [9fans] threads vs forks Topicbox-Message-UUID: b16efe18-ead4-11e9-9d60-3106f5b1d025 On Wed, Mar 4, 2009 at 8:52 AM, J.R. Mauro wrote: > Now I haven't tested an SSD for performance, but I know they are > better. Well that I don't understand at all. Is this "faith-based" performance measurement? :-) I have a friend who is doing lots of SSD testing and they're not always better. For some cases, you pay a whole lot more for 2x greater throughput. it's not as simple as "know they are better". >If I got one, this problem would likely subside, but I'm not > convinced that SSDs are durable enough, despite what the manufacturers > say. I haven't seen many torture tests on them, but the fact that > erasing a block destroys it a little bit is scary. I do a lot of > sustained writes with my typical desktop workload over the same files, > and I'd rather not trust them to something that is delicate enough to > need filesystem algorithms to be optimized for so they don't "wear > out". in most cases write leveling is not in the file system. It's in the hardware or in a powerpc that is in the SSD controller. It's worth your doing some reading here. That said, I sure would like to have a fusion IO card for venti. From what my friend is telling me the fusion card would be ideal for venti -- as long as we keep only the arenas on it. ron