Re: [HTCondor-users] Slow schedd history queries in python

[Jason Patton <jpatton@xxxxxxxxxxx>]

Hi JT,

When using a constraint _expression_ with history, the _expression_ is applied to every job ad in the history. As you've probably found out with the CLI tool, using "-completedsince" speeds things up by stopping the search as soon as the history tool finds a job that has been completed before that date. There is a similar flag to the Schedd.history() function called "since" that you can pass an _expression_ to that, once it becomes true, ends the search early:

$ python3 -m timeit "import time, htcondor2; s = htcondor2.Schedd(); list(s.history(constraint=f'CompletionDate > {time.time() - 3600}'))"
1 loop, best of 5: 3.7 sec per loop

$ python3 -m timeit "import time, htcondor2, classad2; s = htcondor2.Schedd(); list(s.history(since=classad2.ExprTree(f'CompletionDate > {time.time() - 3600}')))"
20 loops, best of 5: 8.26 msec per loop

(Note that calling Schedd.history() returns a generator, and the history call doesn't actually happen until it is consumed, e.g. using list() on it or using it in a loop.)

Jason

On Thu, May 22, 2025 at 8:40âAM Jeff Templon <templon@xxxxxxxxx> wrote:

Addendum:

Is there a way to make this

similarly fast as the command line version?

should have made explicit that I meant, can the schedd.history() usage be made as fast as the command line version.

Of course, running the unix command under the hood is always a possibility.

JT

On 22 May 2025, at 15:30, Jeff Templon <templon@xxxxxxxxx> wrote:

Hi,

This query:

condor_history -completedsince $(date -d "10 minutes ago" +"%sâ)

Takes on the order of a tenth of a second from the unix command line.

This bit of code:

shist_iter = schedd.history(

constraint='CompletionDate > %d' % (now - 600),

projection=[

"ProcId",

"ClusterId",

"JobStatus",

"AccountingGroup",

"AcctGroup",

"Owner",

"CompletionDate",

"CpusProvisioned",

"JobCurrentStartDate",

"JobCategory", "JobUniverse"

]

)

print("schedd hist query done")

# unfortunately, schedd.history returns a HistoryIterator, unlike Schedd.query which returns a list. The lines below

# make lists corresponding to the contents of the HistoryIterators, so we can use them more than once.

# unfortunately, schedd.history returns a HistoryIterator, unlike Schedd.query which returns a list. The lines below

# make lists corresponding to the contents of the HistoryIterators, so we can use them more than once.

print("start iter to list")

shist = list()

for ad in shist_iter:

shist.append(ad)

print("done iter to listâ)

Is similarly quick until the âfor ad in ââ bit, which takes order 7 seconds, even though there are only 160 records in that query. Is there a way to make this

similarly fast as the command line version?

JT

e

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