== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:57:21 (1761317841)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 1.59409 s, 65.8 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: 0.677931
Iter 1/10: OSS cache speed: 0.982477
Iter 1/10: ladvise speed: 0.955523
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.715471
Iter 2/10: OSS cache speed: 0.892552
Iter 2/10: ladvise speed: 0.960061
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.709806
Iter 3/10: OSS cache speed: 0.919089
Iter 3/10: ladvise speed: 0.955243
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.726087
Iter 4/10: OSS cache speed: 0.927312
Iter 4/10: ladvise speed: 0.944558
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.806189
Iter 5/10: OSS cache speed: 0.957574
Iter 5/10: ladvise speed: 1.17356
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.973651
Iter 6/10: OSS cache speed: 1.14159
Iter 6/10: ladvise speed: 1.09638
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.954781
Iter 7/10: OSS cache speed: 1.12896
Iter 7/10: ladvise speed: 1.33266
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.02292
Iter 8/10: OSS cache speed: 1.55924
Iter 8/10: ladvise speed: 1.39193
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.13723
Iter 9/10: OSS cache speed: 1.93919
Iter 9/10: ladvise speed: 1.92145
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.25979
Iter 10/10: OSS cache speed: 1.35195
Iter 10/10: ladvise speed: 0.554096
Average uncached read: .89
Average speedup with OSS cached read:  1.17 = +31.46%
Average speedup with ladvise willread:  1.12 = +25.84%
Speedup with OSS cached read less than 20%,  got 1.17%. Skipping ladvise willread check.