Read-only source files (was: Re: [squeak-dev] Why is source code
always in files only?)
leves at elte.hu
Tue Jan 20 01:09:21 UTC 2015
On Mon, 19 Jan 2015, Eliot Miranda wrote:
> On Mon, Jan 19, 2015 at 1:31 PM, Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com> wrote:
> Hi Tobias,
> are you aware of CurrentReadOnlySourceFiles cacheDuring: [...]
> This is to workaround the readOnlyCopy used for thread safety which is the main killer of performance...
> IMO this is a bug. We should simply have a single read-only copy of each sources file and modify the debugger to either save and restore the state of a read-only copy around accessing source, or use its own
> read-only copy (except that the latter approach breaks when one debugs the debugger). The difference in performance between using CurrentReadOnlySourceFiles cacheDuring: [...] and not in anything that
> accesses source is huge. And CurrentReadOnlySourceFiles cacheDuring: [...] is a /lot/ of verbiage to type in doits, and a sign that something is wrong.
How would using a single copy solve the concurrency issues?
I think the real solution would be to use per process copies, which were
initialized lazily, and were closed automatically after some time of
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