Jeff Hostetler ffd4faec90 read-cache: run verify_hdr() in background thread ...

This is a performance optimization.

Teach do_read_index() to call verify_hdr() using a thread
and allow SHA1 verification to run concurrently with the
parsing of index-entries and extensions.

For large index files, this cuts the startup time in half.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>

2017-02-03 07:19:38 +01:00

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