== sanity test 255a: check 'lfs ladvise -a willread' ===== 23:10:41 (1788750641)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 11.6197 s, 9.0 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-ffff9af504e18800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.377734
Iter 1/10: OSS cache speed: 0.37838
Iter 1/10: ladvise speed: 0.438579
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.381944
Iter 2/10: OSS cache speed: 0.429893
Iter 2/10: ladvise speed: 0.461211
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.375696
Iter 3/10: OSS cache speed: 0.422138
Iter 3/10: ladvise speed: 0.449012
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.411728
Iter 4/10: OSS cache speed: 0.474904
Iter 4/10: ladvise speed: 0.474477
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.414931
Iter 5/10: OSS cache speed: 0.479114
Iter 5/10: ladvise speed: 0.591138
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.514192
Iter 6/10: OSS cache speed: 0.582195
Iter 6/10: ladvise speed: 0.589644
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.487756
Iter 7/10: OSS cache speed: 0.583459
Iter 7/10: ladvise speed: 0.580054
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.543227
Iter 8/10: OSS cache speed: 0.664415
Iter 8/10: ladvise speed: 0.747174
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.625612
Iter 9/10: OSS cache speed: 0.787293
Iter 9/10: ladvise speed: 0.718107
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.368678
Iter 10/10: OSS cache speed: 0.229799
Iter 10/10: ladvise speed: 0.42462
Average uncached read: .45
Average speedup with OSS cached read:  .50 = +11%
Average speedup with ladvise willread:  .54 = +20%
Speedup with OSS cached read less than 20%,  got 11%. Skipping ladvise willread check.
fail_loc=0