fixing linux loadOBAlpha problem by strace-ing an image (was Monticello/ftp stopped working for me)

> After ScriptLoader loadOBAlpha problems, I'm now playing a bit with strace.
> very instructive.
>
> strace build/squeak *.image `pwd`/loadOBAlpha.st > tmp.trace 2>&1
>
> Notice a
>    (SourceFiles at: 2) truncate: SmalltalkImage current lastQuitLogPosition.
> This is because repeated ScriptLoader loadOBAlpha are quickly spoiling
> the change log.
>
> Tracing is really slow, especially with these unbuffered writes
> write(6, "^", 1)                        = 1
> write(6, "s", 1)                        = 1
> write(6, "e", 1)                        = 1
> write(6, "l", 1)                        = 1
> write(6, "f", 1)                        = 1
> I remember Eliot noticed this easy potential speed-up already.
>
> I noticed a bunch of try...catch style of open file at startup.
> grep ENOENT ../pharo0.1-10268dev09.04.1/tmp.trace | wc -l
> 4012
> Most are plugin/library search and Freetype related.
> But a few search concern icons and wonderland... Some room for more
> etoys clean-up here?
>
> On my linux box, I can now confirm the socket problem encountered by
> loadOBAlpha is really a (Too many open files) problem.
> Some @!*^# code is trying to open more than 1018 change log files
> which is a bit too much.
> Some file closing happens from time to time but very sparsely.
> This happens while loading
> Installer wiresong
>               project: 'ob';
>               install: 'OB-Refactory'.
>
> Consequently, the following instruction fails.
> Installer lukas
>               project: 'ob';
>               install: 'OB-Regex';
>
> You can find tmp.trace at http://ncellier.ifrance.com/Squeak/tmp.trace.gz
> 26MB gzipped.
>
> -------------------------------------------------------------------------------------------------------
> Now it's easier to debug the change log opener in image.
> But it's not obvious whether we can reproduce in debugger because of
> UI, debugger, GC interactions...
> So we gonna use the MessageTally/Notification tricks:
>
> build/squeak *.image `pwd`/TraceOpenFile.st &
>
> Tally results are copied in OpenFileTally.txt.
> Highly suspect is #readOnlyCopy...
> RemoteString is guilty for not closing the file and relying on some
> finalization actions...
> And OBDynamicProtocols is abusing of this stuff...
>
> So fixing RemoteString by gently closing the file does fix the linux problem...
> build/squeak *.image `pwd`/loadOBAlpha.st &
>
>
> Now this is a good workaround, but what change introduced the problem ?
> there are two solutions:
> - either recent versions of OB are creating the problem
> - or recent changes in Polling UI/or Process changed finalization order
>
> This should be tested in a 3.10.2 image
>