Thanks: I've pushed the syncronization code to the handin repo.
And yes, you're right that `thread` (which is what I think the handin
server uses) doesn't make use of multiple cores. Places sound like the
right construct to use here, but I can already predict one problem:
2htdp/universe depends on
Hi!
After a new deadline, I got good news and bad news.
# Good news
I think *this* bug is fixed. Evidence: instead of crashing at the
first reboot under load, the server survived to 10-20 automated
reboots with the students submitting en masse without never showing
the bug. So not only the patch
On Sunday, November 29, 2015, Paolo Giarrusso wrote:
> On Friday, November 27, 2015 at 3:44:20 AM UTC+1, Robby Findler wrote:
> > Yes, I think you're right. I originally wrote that because I was
> > thinking that this code might be involved in evaluating the user's
> > submission, but I am not pr
On Friday, November 27, 2015 at 3:44:20 AM UTC+1, Robby Findler wrote:
> Yes, I think you're right. I originally wrote that because I was
> thinking that this code might be involved in evaluating the user's
> submission, but I am not pretty sure I was wrong about that.
"not pretty sure"?
AFAICS,
Yes, I think you're right. I originally wrote that because I was
thinking that this code might be involved in evaluating the user's
submission, but I am not pretty sure I was wrong about that. So, yes I
agree that putting this into the production server may be worth a try
(depending on how severe t
On 25 November 2015 at 14:54, Robby Findler wrote:
> I'm still not completely
> sure, but since you seem to be able to provoke the error, that
> emboldens me to suggest you apply the diff below and see if it goes
> away.
I'm doing this. Annoyingly, I can't force the crash at will yet, and
an auto
The stomping on I was worried about would happen at a lower-level as
I don't think that, in general, dynamic-require is thread-safe. After
all, it loads and runs arbitrary code, altho in this case it appears
to be a system level lack of thread safety? I'm still not completely
sure, but since you s
Hi and thanks for reacting promptly!
On 25 November 2015 at 13:52, Robby Findler wrote:
> I don't know what's going on here, but could it be that two threads
> are, in parallel, trying to load the same implementation of an
> unloaded checker and then stomping on each other?
Interesting! Sounds c
I don't know what's going on here, but could it be that two threads
are, in parallel, trying to load the same implementation of an
unloaded checker and then stomping on each other?
The file handin-server/private/reloadable has some dynamic-requires
without appropriate syncronization around them, a
Hi all,
it's me, handin server guy again. Sorry to bother.
Our handin server started "crashing" with "bad variable linkage" errors at
deadline time (presumably under somewhat high load), and since it happened
twice, I thought I'd report it. Any ideas on what's causing this?
After this "crash",
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