== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:10:24 (1774530624)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.928094 s, 113 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 1.82267
Iter 1/10: OSS cache speed: 2.31906
Iter 1/10: ladvise speed: 2.19419
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.44277
Iter 2/10: OSS cache speed: 2.31024
Iter 2/10: ladvise speed: 2.59963
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.08401
Iter 3/10: OSS cache speed: 2.49895
Iter 3/10: ladvise speed: 2.68895
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.71197
Iter 4/10: OSS cache speed: 3.17818
Iter 4/10: ladvise speed: 3.54056
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.29083
Iter 5/10: OSS cache speed: 4.02526
Iter 5/10: ladvise speed: 3.24366
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.70678
Iter 6/10: OSS cache speed: 3.74386
Iter 6/10: ladvise speed: 4.05241
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.10947
Iter 7/10: OSS cache speed: 3.76989
Iter 7/10: ladvise speed: 3.9065
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.85407
Iter 8/10: OSS cache speed: 3.99842
Iter 8/10: ladvise speed: 3.99839
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.36519
Iter 9/10: OSS cache speed: 4.33893
Iter 9/10: ladvise speed: 4.55588
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.25943
Iter 10/10: OSS cache speed: 4.74164
Iter 10/10: ladvise speed: 4.49028
Average uncached read: 3.36
Average speedup with OSS cached read:  3.49 = +3.86%
Average speedup with ladvise willread:  3.52 = +4.76%
Speedup with OSS cached read less than 20%,  got 3.49%. Skipping ladvise willread check.