haridsv

What exactly is "iowait"?

To summarize it in one sentence, 'iowait' is the percentage
of time the CPU is idle AND there is at least one I/O
in progress.

Each CPU can be in one of four states: user, sys, idle, iowait.
Performance tools such as vmstat, iostat, sar, etc. print
out these four states as a percentage.  The sar tool can
print out the states on a per CPU basis (-P flag) but most

maxfischer2781

#!/usr/bin/env python3
from typing import Dict


def switch(cases: Dict[str, str], default='UNDEFINED', separator='\n'):
    # ["IfThenElse(ac, am", "IfThenElse(bc, bm", "IfThenElse(cc, cm", ...]
    switch_expression = separator.join(
        f"IfThenElse({condition}, {on_match},"
        for condition, on_match in cases.items()
    )

maxfischer2781

Notes on using HTCondor-CE with APEL accounting for WLCG

These are tales of An Admin getting APEL+HTCondor-CE to work at GridKa/FZK Tier 1.

As background information, see

• the HTCondor-CE documentation
• the HtCondorCe Accounting notes

Setting up HTCondor-CE for APEL