== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:45:59 (1717019159)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 1.44015 s, 72.8 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: 1.73503
Iter 1/10: OSS cache speed: 1.98668
Iter 1/10: ladvise speed: 2.08182
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.71661
Iter 2/10: OSS cache speed: 2.1437
Iter 2/10: ladvise speed: 2.38827
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.74489
Iter 3/10: OSS cache speed: 2.01513
Iter 3/10: ladvise speed: 2.12937
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 1.63359
Iter 4/10: OSS cache speed: 2.13516
Iter 4/10: ladvise speed: 2.09428
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 1.82467
Iter 5/10: OSS cache speed: 2.23311
Iter 5/10: ladvise speed: 2.28926
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 1.78076
Iter 6/10: OSS cache speed: 2.15815
Iter 6/10: ladvise speed: 2.14301
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 1.55676
Iter 7/10: OSS cache speed: 2.0417
Iter 7/10: ladvise speed: 2.09819
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.71639
Iter 8/10: OSS cache speed: 1.9987
Iter 8/10: ladvise speed: 2.03312
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.67156
Iter 9/10: OSS cache speed: 2.11197
Iter 9/10: ladvise speed: 1.84465
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.45214
Iter 10/10: OSS cache speed: 1.98937
Iter 10/10: ladvise speed: 1.99145
Average uncached read: 1.68
Average speedup with OSS cached read:  2.08 = +23.80%
Average speedup with ladvise willread:  2.10 = +25.00%
Speedup with OSS cached read less than 20%,  got 2.08%. Skipping ladvise willread check.