== sanity test 255a: check 'lfs ladvise -a willread' ===== 19:10:23 (1736986223)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.61608 s, 170 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: 6.87485
Iter 1/10: OSS cache speed: 7.52299
Iter 1/10: ladvise speed: 7.26636
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.16469
Iter 2/10: OSS cache speed: 7.4662
Iter 2/10: ladvise speed: 6.87223
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 6.5822
Iter 3/10: OSS cache speed: 7.41333
Iter 3/10: ladvise speed: 7.669
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 6.2472
Iter 4/10: OSS cache speed: 7.63858
Iter 4/10: ladvise speed: 7.1852
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.31845
Iter 5/10: OSS cache speed: 7.26241
Iter 5/10: ladvise speed: 7.14559
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.92556
Iter 6/10: OSS cache speed: 6.96226
Iter 6/10: ladvise speed: 6.46687
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.62452
Iter 7/10: OSS cache speed: 6.39725
Iter 7/10: ladvise speed: 8.07388
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 6.36973
Iter 8/10: OSS cache speed: 7.516
Iter 8/10: ladvise speed: 7.12801
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.8036
Iter 9/10: OSS cache speed: 6.14766
Iter 9/10: ladvise speed: 6.66372
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 6.36273
Iter 10/10: OSS cache speed: 7.07964
Iter 10/10: ladvise speed: 7.34697
Average uncached read: 6.02
Average speedup with OSS cached read:  7.14 = +18.60%
Average speedup with ladvise willread:  7.18 = +19.26%
Speedup with OSS cached read less than 20%,  got 7.14%. Skipping ladvise willread check.