== sanity test 255a: check 'lfs ladvise -a willread' ===== 14:10:08 (1772305808)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.770046 s, 136 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: 3.90267
Iter 1/10: OSS cache speed: 5.52001
Iter 1/10: ladvise speed: 5.25025
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.99158
Iter 2/10: OSS cache speed: 5.78087
Iter 2/10: ladvise speed: 5.48337
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.05459
Iter 3/10: OSS cache speed: 5.93294
Iter 3/10: ladvise speed: 4.53623
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.73761
Iter 4/10: OSS cache speed: 5.39506
Iter 4/10: ladvise speed: 5.59738
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.70061
Iter 5/10: OSS cache speed: 5.52344
Iter 5/10: ladvise speed: 5.33978
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.25964
Iter 6/10: OSS cache speed: 5.29164
Iter 6/10: ladvise speed: 5.64958
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.28387
Iter 7/10: OSS cache speed: 5.73958
Iter 7/10: ladvise speed: 5.63596
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.98445
Iter 8/10: OSS cache speed: 5.92726
Iter 8/10: ladvise speed: 5.77857
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.11017
Iter 9/10: OSS cache speed: 4.13231
Iter 9/10: ladvise speed: 5.14441
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.8552
Iter 10/10: OSS cache speed: 5.32574
Iter 10/10: ladvise speed: 6.00848
Average uncached read: 4.18
Average speedup with OSS cached read:  5.45 = +30.38%
Average speedup with ladvise willread:  5.44 = +30.14%
Speedup with OSS cached read less than 20%,  got 5.45%. Skipping ladvise willread check.