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Old Oct 5, 2012, 06:09 PM   #1
andymac2210
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Data written/red in activity monitor

I'm getting a bit concerned that my MBP is writing a lot of data to the HDD when I'm doing relatively little.

I have mail, reeder, safari (granted with like 20 tabs), mamp, coda and photoshop open and although my computer has only been on for 12 hours I've 'written' 10gb of data to the SSD.
It's not like I'm doing video editing or anything.

What sort of read/write numbers are other people getting after similar up-times?

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Old Oct 5, 2012, 06:15 PM   #2
simsaladimbamba
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That is normal behaviour, temporary files (caches) have to be written sometime.

Normally modern SSDs have a theoretical write/read limit of 10,000 to 100,000 cycles (P/E cycles), meaning if you had a 64 GB SSD and its cycle limit would be 10,000, you would have to write 625 TB to it, which would be 351 GB per day everyday for the next five years. Assuming those numbers vary and it would only be a tenth of that, it would still mean 35 GB per day, which under normal usage no average computer consumer does, not even with temporary files.

I cannot offer any of my statistics, as I already copied dozens of GBs today.
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Old Oct 5, 2012, 06:17 PM   #3
andymac2210
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Quote:
Originally Posted by simsaladimbamba View Post
That is normal behaviour, temporary files (caches) have to be written sometime.

Normally modern SSDs have a theoretical write/read limit of 10,000 to 100,000 cycles (P/E cycles), meaning if you had a 64 GB SSD and its cycle limit would be 10,000, you would have to write 625 TB to it, which would be 351 GB per day everyday for the next five years. Assuming those numbers vary and it would only be a tenth of that, it would still mean 35 GB per day, which under normal usage no average computer consumer does, not even with temporary files.

I cannot offer any of my statistics, as I already copied dozens of GBs today.

That's interesting.
I thought because I've had no page outs stuff would just be written to the ram first?
Heck I've only had 1gb of page ins so far, I've hardly used the computer today.
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Old Oct 5, 2012, 06:22 PM   #4
simsaladimbamba
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Quote:
Originally Posted by andymac2210 View Post
That's interesting.
I thought because I've had no page outs stuff would just be written to the ram first?
Heck I've only had 1gb of page ins so far, I've hardly used the computer today.
Not everything gets stored in the RAM, temporary files, especially cache, get written to the mass storage device your OS resides on, in case the application needs access to it later. And Page-Ins can be ignored.
Mac OS X: Reading system memory usage in Activity Monitor
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