[SPDK] Re: clarifications on spdk-top

Hi Or,
Which tab do you refer to? Threads or Cores? On Cores tabs it should sum to around 1s (if you didn't change refresh rate with 'r' key). On Threads tab it won't sum to 1s because there are many threads on core and we measure stats per core time, so if you sum all threads busy and idle time from one particular core you will get around 1s. Let me know if that makes sense.

Regards,
Maciek

-----Original Message-----
From: Or Gerlitz <gerlitz.or(a)gmail.com> 
Sent: Monday, July 6, 2020 11:44 AM
To: Szwed, Maciej <maciej.szwed(a)intel.com>
Cc: Storage Performance Development Kit <spdk(a)lists.01.org>; Alexey Marchuk <alexeymar(a)mellanox.com>; Harris, James R <james.r.harris(a)intel.com>; Walker, Benjamin <benjamin.walker(a)intel.com>
Subject: clarifications on spdk-top

Hi,

I understand you are the author of this, I didn't find any documentation on that in the spdk docs. Could you prepare a quick memo and post it here and hopefully later have something more official?

For never-sleeping framework like spdk/dpdk there's always the kinda critical question of the break-down to idle (we didn't get anything new to process) vs busy (we have some work to do) %% (e.g portions of a second when sampled repeatly) -- when I looked on the idle/busy columns the numbers were in us but it seems they didn't sum to 1M. So what is expected there?

Thanks,

Or.