From: "A. Jesse Jiryu Davis" <je...@10gen.com>
Date: Wed, 22 Aug 2012 09:02:20 -0700 (PDT)
Local: Wed, Aug 22 2012 12:02 pm
Subject: Re: [mongodb-user] Why SSD's result in less time write lock when DB fits completely in RAM?
Mongo doesn't really have a notion of "straight to disk" writes. However,
Can you confirm that your fsync times are shorter? If your mongod is in MMS
On Wednesday, August 22, 2012 11:02:45 AM UTC-4, Shi Shei wrote:
> Yes, journalling is off.
> Thank you for the links. I read the articles but didn't find any new
> I'd be glad if you or someone else have some other pointers.
> On Wednesday, August 22, 2012 1:34:23 PM UTC+2, Sammaye wrote:
>> Journalling is off? Hmmm, ok.
>> But yea, then that's one thing that doesn't effect write lock.
>> You have to take into account the speed difference in general between the
>> For general info here is another link I liked:
>> I cannot invest the time to personally answer the question fully but
>> On 22 August 2012 12:23, Shi Shei <QTRAUR...@spammotel.com> wrote:
>>> What do you mean with "the amount "safe" straight to disk writes"? We
>>> On Wednesday, August 22, 2012 12:46:34 PM UTC+2, Sammaye wrote:
>>>> One reason could be the amount "safe" straight to disk writes you are
>>>> On 22 August 2012 10:40, Shi Shei <QTRAUR...@spammotel.com> wrote:
>>>>> We observed a dramatically decrease of write lock time when we
>>>>> I thought that mongo writes to memory mapped files, so the global (or
>>>>> Hence my question, why SSD's help to decrease write lock time?
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>>>>> See also the IRC channel -- freenode.net#mongodb
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