linux-kernel - Re: [RFC PATCH v3 0/7] DAMON based tiered memory management for CXL

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Date: Tue,  9 Apr 2024 18:59:38 +0900
From: Honggyu Kim <honggyu.kim@...com>
To: Honggyu Kim <honggyu.kim@...com>
Cc: sj@...nel.org,
	damon@...ts.linux.dev,
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	Gregory Price <gregory.price@...verge.com>
Subject: Re: [RFC PATCH v3 0/7] DAMON based tiered memory management for CXL

On Mon,  8 Apr 2024 22:41:04 +0900 Honggyu Kim <honggyu.kim@...com> wrote:
[...]
> To explain this, I better share more test results.  In the section of
> "Evaluation Workload", the test sequence can be summarized as follows.
> 
>   *. "Turn on DAMON."
>   1. Allocate cold memory(mmap+memset) at DRAM node, then make the
>      process sleep.
>   2. Launch redis-server and load prebaked snapshot image, dump.rdb.
>      (85GB consumed: 52GB for anon and 33GB for file cache)
>   3. Run YCSB to make zipfian distribution of memory accesses to
>      redis-server, then measure execution time.
>   4. Repeat 4 over 50 times to measure the average execution time for
>      each run.

Sorry, "Repeat 4 over 50 times" is incorrect.  This should be "Repeat 3
over 50 times".

>   5. Increase the cold memory size then repeat goes to 2.
> 
> I didn't want to make the evaluation too long in the cover letter, but
> I have also evaluated another senario, which lazyly enabled DAMON just
> before YCSB run at step 4.  I will call this test as "DAMON lazy".  This
> is missing part from the cover letter.
> 
>   1. Allocate cold memory(mmap+memset) at DRAM node, then make the
>      process sleep.
>   2. Launch redis-server and load prebaked snapshot image, dump.rdb.
>      (85GB consumed: 52GB for anon and 33GB for file cache)
>   *. "Turn on DAMON."
>   4. Run YCSB to make zipfian distribution of memory accesses to
>      redis-server, then measure execution time.
>   5. Repeat 4 over 50 times to measure the average execution time for
>      each run.
>   6. Increase the cold memory size then repeat goes to 2.
> 
> In the "DAMON lazy" senario, DAMON started monitoring late so the
> initial redis-server placement is same as "default", but started to
> demote cold data and promote redis data just before YCSB run.
[...]

Thanks,
Honggyu