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2026-03-10 05:33:24 +0100Goodbye_Vincent1(cyvahl@freakshells.net) Goodbye_Vincent
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2026-03-10 06:33:03 +0100ChaiTRex(~ChaiTRex@user/chaitrex) ChaiTRex
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2026-03-10 10:29:53 +0100arandombit(~arandombi@user/arandombit) arandombit
2026-03-10 10:31:23 +0100Freakie(~Freakie@37.96.7.244)
2026-03-10 10:35:27 +0100arandombit(~arandombi@user/arandombit) (Ping timeout: 268 seconds)
2026-03-10 10:39:33 +0100 <Freakie> hi, I was here a few days ago with questions about profiling my program involving BDD algorithms (in case anyone was there and remember)
2026-03-10 10:41:31 +0100 <Freakie> over half my runtime is still spent on garbage collecting and further profiling suggests that something like 90% of all of my allocations are spent on updating a priority queue (a lot of elements are inserted). I'm not sure I can do much to help my situation but if anyone could lend some insight again I'd be grateful
2026-03-10 10:41:59 +0100danza(~danza@user/danza) (Ping timeout: 245 seconds)
2026-03-10 10:45:31 +0100danza(~danza@user/danza) danza
2026-03-10 10:50:52 +0100 <probie> How is the priority queue implemented?
2026-03-10 10:51:50 +0100 <Freakie> I've used a typeclass as an abstraction over different implementations
2026-03-10 10:52:09 +0100 <Freakie> mostly I've just used Data.Set, but I've also played around with MultiSet and the MinQueue from pqueue
2026-03-10 10:52:43 +0100 <Freakie> they both seem to have the same allocation rate from what I've been able to gather from experimentation
2026-03-10 10:54:40 +0100 <Freakie> my fear is that the priority queues just have to handle too much data but on the input sizes I need to handle to the point that rebalancing is infeasible
2026-03-10 10:56:19 +0100 <probie> Inserting an element is always going to cause an allocation (or more). You can't really avoid that without mutation (or linearity)
2026-03-10 10:58:01 +0100 <Freakie> the space cost just seems absurdly high still
2026-03-10 10:58:33 +0100 <Freakie> I was considering maybe restructuring my program to reuse the priority queue between different stages of the application so the pointer is kept alive throghout
2026-03-10 10:58:42 +0100 <Freakie> but i'm not sure if that's the right track
2026-03-10 10:59:38 +0100 <Freakie> otherwise I should be able to take advantage of my data structure to offload a lot of the work to using lists which should prevent a lot of rebalancing (and therefore allocations)
2026-03-10 11:00:28 +0100 <Freakie> for me the issue is just having been told multiple times that spending >50% of the runtime on GC suggests that something is wrong with the program ,so I was hoping to have some better way of evaluating that statement
2026-03-10 11:02:26 +0100tromp(~textual@2001:1c00:3487:1b00:5cb9:87bb:7dcb:d170)
2026-03-10 11:06:33 +0100fp1(~Thunderbi@2001:708:20:1406::10c5) (Ping timeout: 248 seconds)
2026-03-10 11:08:01 +0100xff0x(~xff0x@fsb6a9491c.tkyc517.ap.nuro.jp) (Ping timeout: 272 seconds)
2026-03-10 11:11:08 +0100dhil(~dhil@5.151.29.141) dhil
2026-03-10 11:16:16 +0100 <probie> Without actually seeing the code, all anyone here can do is guess. If the situation allows it, try a priority queue backed by some kind of mutable STVector, since you'll be able to enqueue/dequeue without allocations (beyond the occasional allocation to resize the backing vector)
2026-03-10 11:16:53 +0100tromp(~textual@2001:1c00:3487:1b00:5cb9:87bb:7dcb:d170) (Ping timeout: 272 seconds)
2026-03-10 11:19:43 +0100arandombit(~arandombi@user/arandombit) arandombit
2026-03-10 11:21:58 +0100 <Freakie> unfortunately purity is pretty essential to what i'm trying to do, which is also why I'm having a difficult time brainstorming alternatives
2026-03-10 11:22:00 +0100comerijn(~merijn@77.242.116.146) merijn
2026-03-10 11:24:30 +0100merijn(~merijn@77.242.116.146) (Ping timeout: 246 seconds)
2026-03-10 11:27:11 +0100danz32096(~danza@user/danza) danza
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2026-03-10 11:33:24 +0100arandombit(~arandombi@user/arandombit) (Ping timeout: 264 seconds)
2026-03-10 11:39:02 +0100marinelli(~weechat@gateway/tor-sasl/marinelli) (Remote host closed the connection)
2026-03-10 11:39:21 +0100 <jreicher> Freakie: Just in case it helps, may I question why the garbage collection is "undesirable"? That might sound stupid, but what reason do you have to think it's not needed for your use case?
2026-03-10 11:39:24 +0100marinelli(~weechat@gateway/tor-sasl/marinelli) marinelli
2026-03-10 11:39:41 +0100 <jreicher> Some things just have to be GCed; that's the nature of them. (Not the implementation, but the algorithm itself)
2026-03-10 11:40:30 +0100 <probie> Freakie: does performance improve if you make the nursery bigger? (e.g. try something like `+RTS -A64m -RTS`)
2026-03-10 11:48:46 +0100arandombit(~arandombi@user/arandombit) arandombit
2026-03-10 11:52:22 +0100acidjnk_new(~acidjnk@p200300d6e700e547f0589d3e513577e0.dip0.t-ipconnect.de) acidjnk
2026-03-10 11:55:31 +0100acidjnk(~acidjnk@p200300d6e700e52576436b4620b4c2a8.dip0.t-ipconnect.de) (Ping timeout: 272 seconds)
2026-03-10 11:56:58 +0100 <Freakie> I've thought about nursery size before but never got around to it, I guess I'll give it a try in not too long
2026-03-10 11:57:33 +0100 <Freakie> jreicher it's "undesirable" in the sense that up to 3/4 of the actual runtime is spent not doing work but just garbage collection
2026-03-10 11:58:30 +0100 <Freakie> obviously garbage collection is unavoidable but if the runtime explodes for reasons not directly related to the work itself (i.e., not following the asymptotics) then it should be fixed
2026-03-10 12:00:20 +0100 <Freakie> what confuses me a little is that the algorithm has two parts that are supposed to be roughly equal in work intensity but according to my profiles (at least the eventlog2html renders of them), only one of the algorithms are truly "busy" in terms of allocations
2026-03-10 12:00:28 +0100 <Freakie> and I'm not sure how exactly to troubleshoot that
2026-03-10 12:03:43 +0100xff0x(~xff0x@2405:6580:b080:900:cfba:7074:7dbc:e7e9)
2026-03-10 12:10:43 +0100marinelli(~weechat@gateway/tor-sasl/marinelli) (Remote host closed the connection)
2026-03-10 12:11:08 +0100marinelli(~weechat@gateway/tor-sasl/marinelli) marinelli
2026-03-10 12:20:08 +0100Googulator(~Googulato@2a01-036d-0106-0119-01e8-0aed-2fac-7c8a.pool6.digikabel.hu) (Quit: Client closed)
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2026-03-10 12:23:44 +0100Pozyomka(~pyon@user/pyon) pyon
2026-03-10 12:26:40 +0100CiaoSen(~Jura@2a02:8071:64e1:da0:5a47:caff:fe78:33db) CiaoSen
2026-03-10 12:29:40 +0100tristanC(~tristanC@user/tristanc) tristanC
2026-03-10 12:35:20 +0100Googulator(~Googulato@2a01-036d-0106-0119-01e8-0aed-2fac-7c8a.pool6.digikabel.hu) (Quit: Client closed)
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2026-03-10 12:37:57 +0100pabs3(~pabs3@user/pabs3) (Ping timeout: 272 seconds)
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2026-03-10 12:40:09 +0100marinelli(~weechat@gateway/tor-sasl/marinelli) marinelli
2026-03-10 12:42:32 +0100Freakie(~Freakie@37.96.7.244) (Quit: Client closed)
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2026-03-10 12:51:04 +0100pabs3(~pabs3@user/pabs3) pabs3
2026-03-10 12:55:16 +0100 <comerijn> Freakie: How big is your queue?
2026-03-10 12:56:44 +0100 <comerijn> because there's a well known blogpost from ages ago of a company struggle with Haskell GC also for a queue and part of their problem (and, I suspect, yours) was that their inherent problem involved a large liveset
2026-03-10 12:56:56 +0100 <comerijn> And large live sets are a worst case for GHCs GC approach
2026-03-10 12:57:09 +0100Freakie(~Freakie@37.96.7.244)
2026-03-10 12:59:44 +0100arandombit(~arandombi@user/arandombit) (Remote host closed the connection)
2026-03-10 13:01:04 +0100 <c_wraith> Huh. I never really thought about making each entry in a container its own compact region, but there are cases where that could really reduce GC pressure. (like if there aren't all that many entries, but they have a lot of internal pointers)
2026-03-10 13:02:47 +0100arandombit(~arandombi@2a02:2455:8656:7100:4919:8888:312f:1c7c)
2026-03-10 13:02:47 +0100arandombit(~arandombi@2a02:2455:8656:7100:4919:8888:312f:1c7c) (Changing host)
2026-03-10 13:02:47 +0100arandombit(~arandombi@user/arandombit) arandombit
2026-03-10 13:03:37 +0100 <Freakie> I've been considering doing that as well but it's a larger process
2026-03-10 13:03:50 +0100 <Freakie> (assuming you're responding to my previous comments)