Memory data width and performance

[trepmag]

When I switched from my previous laptop (ideadpad 710s 13ikb, i7-7500u) to the yoga slim 7 are05 it means going from:

• 8 to 16 GB of ram
• intel 7500u to ryzen 4800u

Since then, I didn't made any benchmarks to confirm I was switching to a better performing device, but I always felt that the general desktop behaviors was less reactive with the new device; weirdly!?!?...

So, lately I took some time to grab back my previous device to digg into this and here are some quick findings (ubuntu 20.04):

• gnome shell feels more reactive on previous laptop which I can confirm side by side: window effects and app launch time (but still a feeling)
• libreoffice.write launchs in ~ 1.30 seconds with the previous device while the yoga slim 7 takes ~ 3.20 seconds (hot launched)
• sysbench memory test (https://wiki.gentoo.org/wiki/Sysbench) reveals that 'memory worload' performance of the yoga slim7 is under the previous laptop (magnitude of ~ 1.5 in favor of the intel device in terms of execution time threads fairness)

So, given the above I tried to figure any memory differences btw the 2 devices and while most parameters are in favor or the ryzen device the following warns me:

• Data Width: 32 bits for the yoga slim 7 are05
• Data Width: 64 bits for ideapad 710s 13ikb

At the moment I'm unsure of the Data Width parameter meaning; but I suspect it might be equivalent to something like bus width which could means the amount of bits transfered by cycles?!?...

Any thought on this?

Annexes: Yoga slim7 ar05 output for dmidecode memory and sysbench memory workload: https://gist.github.com/trepmag/bafc4370d0c21d483a73323bcbe15a6f

[sarvasana]

Ubuntu 20.04 with which kernel?

I am on manjaro with kernel 5.12.
No performance issues here.
LibreOffice Write is on my screen in ~1.5 seconds.

If you let me know what Sysbench tests to run, I could post the results for comparison.

[trepmag]

Ubuntu 20.04 with kernel 5.10.23... Just tried with kernel 5.12 but ~ same result...

Here is the sysbench test:

$ sysbench memory --threads=4 run

Result:

sysbench 1.0.18 (using system LuaJIT 2.1.0-beta3)

Running the test with following options:
Number of threads: 4
Initializing random number generator from current time


Running memory speed test with the following options:
  block size: 1KiB
  total size: 102400MiB
  operation: write
  scope: global

Initializing worker threads...

Threads started!

Total operations: 95855763 (9583950.31 per second)

93609.14 MiB transferred (9359.33 MiB/sec)


General statistics:
    total time:                          10.0001s
    total number of events:              95855763

Latency (ms):
         min:                                    0.00
         avg:                                    0.00
         max:                                    0.09
         95th percentile:                        0.00
         sum:                                30129.92

Threads fairness:
    events (avg/stddev):           23963940.7500/84370.59
    execution time (avg/stddev):   7.5325/0.01

[sarvasana]

❯ sysbench memory --threads=4 run
sysbench 1.0.20 (using system LuaJIT 2.0.5)

Running the test with following options:
Number of threads: 4
Initializing random number generator from current time


Running memory speed test with the following options:
  block size: 1KiB
  total size: 102400MiB
  operation: write
  scope: global

Initializing worker threads...

Threads started!

Total operations: 91613835 (9159910.26 per second)

89466.64 MiB transferred (8945.22 MiB/sec)


General statistics:
    total time:                          10.0001s
    total number of events:              91613835

Latency (ms):
         min:                                    0.00
         avg:                                    0.00
         max:                                    0.41
         95th percentile:                        0.00
         sum:                                30431.69

Threads fairness:
    events (avg/stddev):           22903458.7500/76231.68
    execution time (avg/stddev):   7.6079/0.01

Yours outperforms mine.

[sarvasana]

I am not on Gnome 40.

[trepmag]

(gnome 3.38.4)

Result for the ideapad i7-7500u; much better:

$ sysbench memory --threads=4 run
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)

Running the test with following options:
Number of threads: 4
Initializing random number generator from current time


Running memory speed test with the following options:
  block size: 1KiB
  total size: 102400MiB
  operation: write
  scope: global

Initializing worker threads...

Threads started!

Total operations: 104857600 (13456271.61 per second)

102400.00 MiB transferred (13140.89 MiB/sec)


General statistics:
    total time:                          7.7910s
    total number of events:              104857600

Latency (ms):
         min:                                    0.00
         avg:                                    0.00
         max:                                    7.70
         95th percentile:                        0.00
         sum:                                19510.72

Threads fairness:
    events (avg/stddev):           26214400.0000/0.00
    execution time (avg/stddev):   4.8777/0.01

[trepmag]

What is you $ sudo dmidecode --type memory; here it is: https://gist.github.com/trepmag/bafc4370d0c21d483a73323bcbe15a6f#dmidecode-memory

[jrandiny]

Interesting, I have also noticed the problem of slower apps opening, however I always think it must be the ssd