== sanity test 255a: check 'lfs ladvise -a willread' ===== 21:59:50 (1772679590)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.98686 s, 17.5 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=8
fail_loc=0x237
Asynchronous ladvise shouldn't wait
llite.lustre-ffff9fd585213800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 1.84121
Iter 1/10: OSS cache speed: 2.33641
Iter 1/10: ladvise speed: 2.15756
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.81973
Iter 2/10: OSS cache speed: 1.97101
Iter 2/10: ladvise speed: 2.19955
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.08583
Iter 3/10: OSS cache speed: 2.01948
Iter 3/10: ladvise speed: 0.69828
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.686074
Iter 4/10: OSS cache speed: 0.874527
Iter 4/10: ladvise speed: 1.61292
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 1.95141
Iter 5/10: OSS cache speed: 2.3019
Iter 5/10: ladvise speed: 2.13306
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.122
Iter 6/10: OSS cache speed: 2.48078
Iter 6/10: ladvise speed: 2.52772
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.26285
Iter 7/10: OSS cache speed: 2.26001
Iter 7/10: ladvise speed: 2.37187
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.29367
Iter 8/10: OSS cache speed: 2.38404
Iter 8/10: ladvise speed: 2.37356
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.24185
Iter 9/10: OSS cache speed: 2.34727
Iter 9/10: ladvise speed: 2.26762
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.36925
Iter 10/10: OSS cache speed: 2.39233
Iter 10/10: ladvise speed: 2.31884
Average uncached read: 1.96
Average speedup with OSS cached read:  2.13 = +8%
Average speedup with ladvise willread:  2.06 = +5%
Speedup with OSS cached read less than 20%,  got 8%. Skipping ladvise willread check.
fail_loc=0