Re: [PATCH v2 00/13] more miscellaneous Bloom filter improvements, redux

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On 9/17/2020 9:34 AM, Taylor Blau wrote:
> Junio,
> 
> On Wed, Sep 16, 2020 at 09:10:49PM -0400, Taylor Blau wrote:
>> I should have the patch in your inbox by the end of tonight, depending
>> on how fast my workstation can run the ASan-enabled test suite 13 times
>> ;).
> 
> All finished. This is sufficient to fix the ASan-enabled test suite,
> along with fixing a bug where we wouldn't respect the limit on changed
> paths when loading an existing commit-graph. This has nothing to do with
> the user-specified '--max-new-filters', nor does it mean that we're
> storing the limit in the commit-graph file. Instead it's because we're
> loading the bloom_filter_settings struct from the graph and
> initializing it ourselves, instead of using the default values (which is
> the case when we don't load a graph at all).
> 
> Anyway, let's use this instead of 6/13. Here's an inter-diff that shows
> the fix and test change:
> 
>   diff --git a/commit-graph.c b/commit-graph.c
>   index 33af6c2430..fc6c6fdc3e 100644
>   --- a/commit-graph.c
>   +++ b/commit-graph.c
>   @@ -424,6 +424,7 @@ struct commit_graph *parse_commit_graph(struct repository *r,
>           graph->bloom_filter_settings->hash_version = hash_version;
>           graph->bloom_filter_settings->num_hashes = get_be32(data + chunk_offset + 4);
>           graph->bloom_filter_settings->bits_per_entry = get_be32(data + chunk_offset + 8);
>   +				graph->bloom_filter_settings->max_changed_paths = DEFAULT_BLOOM_MAX_CHANGES;

This whitespace looks strange in the inter-diff...

>  				graph->bloom_filter_settings->bits_per_entry = get_be32(data + chunk_offset + 8);
> +				graph->bloom_filter_settings->max_changed_paths = DEFAULT_BLOOM_MAX_CHANGES;

...but it is correct in the patch itself.

> -	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15}" trace2.txt &&
> +	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15,\"max_changed_paths\":512" trace2.txt &&
>  	GIT_TRACE2_EVENT="$(pwd)/trace2-auto.txt" \
>  		GIT_TRACE2_EVENT_NESTING=5 \
>  		git commit-graph write --reachable --changed-paths &&
> -	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15}" trace2-auto.txt
> +	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15,\"max_changed_paths\":512" trace2-auto.txt

I appreciate the additional tests to guarantee this is set
correctly.

Thanks,
-Stolee




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