#!/bin/sh

test_description='performance of fetches from bitmapped packs'
. ./perf-lib.sh

test_perf_default_repo

test_expect_success 'create bitmapped server repo' '
        git config pack.writebitmaps true &&
        git repack -ad
'

# simulate a fetch from a repository that last fetched N days ago, for
# various values of N. We do so by following the first-parent chain,
# and assume the first entry in the chain that is N days older than the current
# HEAD is where the HEAD would have been then.
for days in 1 2 4 8 16 32 64 128; do
        title=$(printf '%10s' "($days days)")
        test_expect_success "setup revs from $days days ago" '
                now=$(git log -1 --format=%ct HEAD) &&
                then=$(($now - ($days * 86400))) &&
                tip=$(git rev-list -1 --first-parent --until=$then HEAD) &&
                {
                        echo HEAD &&
                        echo ^$tip
                } >revs
        '

        test_perf "server $title" '
                git pack-objects --stdout --revs \
                                 --thin --delta-base-offset \
                                 <revs >tmp.pack
        '

        test_size "size   $title" '
                wc -c <tmp.pack
        '

        test_perf "client $title" '
                git index-pack --stdin --fix-thin <tmp.pack
        '
done

test_done