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visits member for 4 years, 11 months
seen Oct 3 at 10:04

Sep
11
comment Set default numa policy to “interleave” system wide
Let's say mostly 2-socket, but does it matter?
Sep
11
comment Set default numa policy to “interleave” system wide
Let's say RHEL and x86 commodity servers (e.g., Dell poweredge stuff).
Sep
11
comment Set default numa policy to “interleave” system wide
@ewwhite We are largely using RHEL, although I'm especially interested on options available on all modern Linux distros.
Sep
11
comment Set default numa policy to “interleave” system wide
At this point curiosity and the need to test different configurations. One of the favorite responses to any question on stackexchange sites seems to be "why would you want to even do that?!". Well one other common response is "You need to test that (configuration, idea, optmization, etc)". So to test things you need to configure them in different ways...
Sep
11
comment Set default numa policy to “interleave” system wide
Based on my limited understanding of numad, it doesn't seem like it can do what I want. It mostly moves memory around after the fact, trying to consolidate working sets that have become spread across nodes - but it doesn't seem like affects the initial allocation node. So it can only help me "de-interleave" but never increase the interleaving.
Sep
11
comment Set default numa policy to “interleave” system wide
Basically I have a situation where it may be difficult to use numactrl explicitly to launch the process, so I was curious if there was a way to set the fault. The various policies, such as interleave do seem to exist (the kernel uses interleave at startup, for example) so it seemed that there would be some way to set the default.
Dec
15
comment Monitor network traffic volume over interface
Looks great, unfortunately I am not able to install any new tools on these locked down boxes.
Dec
2
comment Monitor network traffic volume over interface
D'oh, search fail (and I tried). To be fair, I think it's a serverfault question, not a SO one :)
Jan
18
comment Local or public NTP servers?
Hah, it's been a long time since I've had any homework :) I'm not a personally a network admin with thousands of hosts - but the question came up and I'm interested in the existing best practices.
Dec
23
comment Is asymmetric latency common in practice?
I ask because if you want to optimize communication some particular grid/cloud structure of hosts, you'll be able to do it best if you know the one-way latencies of each link. The one-way latencies are difficult/impossible to calculate in practice, however, so you are left with round-trip times - so I'm curious whether 1/2 the RTT is in practice a good approximation to the one way latency.
Dec
23
comment Is asymmetric latency common in practice?
OK, but these just means that latency has some jitter and the whole process has some random deviation on each request - but this also imply that this asymmetry would remain relative constant (at least in sign) over time?
Dec
23
comment Is asymmetric latency common in practice?
Can you give details? If you can do it, you'd be able to show up the supposed "proof" on stackoverflow for this very question (link in OP).