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2TB fusion stall issue

L

littlehuman

macrumors newbie
Original poster
Nov 22, 2010
27
2
Hi!

I just got my late iMac 5k with 2TB fusion a few days ago. For internet browsing and coding, it works great.

I finally installed Lightroom and Photoshop today and I'm having delay/stall issue whenever I close either of them or change tab to tab in the application.

When I run disk speed performance, I get 316 write and 885 read. It's actually faster than my early 2013 Macbook Pro retina.

I'm not sure where this stall/delay comes from...

If I'm okay with slower performance of SSD, should I change to external SSD instead?
 
Do you notice a lot of disk I/O when your application stalls ?
Maybe it's not a FD problem ...
 
Hi rbart,

When I quit photoshop, CPU spikes up to 80%. Other than that..I don't see anything special.
 
How much memory do you have in your iMac and what's the memory pressure graph like? I've got a 2TB fusion in my iMac and never see any stalls like that (but I do have 32GB of Ram in it)
 
Phil A. said:
How much memory do you have in your iMac and what's the memory pressure graph like? I've got a 2TB fusion in my iMac and never see any stalls like that (but I do have 32GB of Ram in it)
Click to expand...

Hi Phil A., I have 24gb ram.
[doublepost=1487327420][/doublepost]
rbart said:
If only the CPU is used, it seems it's not a FD issue
Click to expand...

It's tricky to debug in that case..
 
littlehuman said:
When I run disk speed performance, I get 316 write and 885 read. It's actually faster than my early 2013 Macbook Pro retina.
Click to expand...
Even though you have a fusion drive if you run a disk speed test like BlackMagic it only measures the speed of the SSD portion.

Your issue may stem from the fact that your fast SSD portion is working with a very slow HDD portion (i.e. The fusion setup).
 
varian55zx said:
Even though you have a fusion drive if you run a disk speed test like BlackMagic it only measures the speed of the SSD portion.

Your issue may stem from the fact that your fast SSD portion is working with a very slow HDD portion (i.e. The fusion setup).
Click to expand...
When the problem occurs, the OP doesn't notice any disk I/O, onlys high CPU usage, so the problem is not the FD.
 
rbart said:
When the problem occurs, the OP doesn't notice any disk I/O, onlys high CPU usage, so the problem is not the FD.
Click to expand...
OK I may have misread.

Now that I go back I do see where he mentions that.

It's possible it may have nothing to do with the drive at all.

I don't see anything indicating it must be due to the drive or fusion drive.
 
varian55zx said:
OK I may have misread.

Now that I go back I do see where he mentions that.

It's possible it may have nothing to do with the drive at all.

I don't see anything indicating it must be due to the drive or fusion drive.
Click to expand...

So for..lightroom, it is actually a known issue. It has nothing to do with fusion drive. If you configure your lightroom to use your GPU, it stalls time to time.

For photoshop, I still have no idea.
 
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