== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:31:43 (1788841903)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.3142 s, 7.9 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-ffff8a99455d7800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.428489
Iter 1/10: OSS cache speed: 0.413592
Iter 1/10: ladvise speed: 0.472146
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.426413
Iter 2/10: OSS cache speed: 0.393174
Iter 2/10: ladvise speed: 0.397986
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.374188
Iter 3/10: OSS cache speed: 0.453133
Iter 3/10: ladvise speed: 0.462725
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.426775
Iter 4/10: OSS cache speed: 0.417656
Iter 4/10: ladvise speed: 0.411305
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.396259
Iter 5/10: OSS cache speed: 0.414105
Iter 5/10: ladvise speed: 0.4281
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.342318
Iter 6/10: OSS cache speed: 0.463372
Iter 6/10: ladvise speed: 0.433399
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.44456
Iter 7/10: OSS cache speed: 0.497383
Iter 7/10: ladvise speed: 0.482823
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.395931
Iter 8/10: OSS cache speed: 0.436582
Iter 8/10: ladvise speed: 0.449443
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.362349
Iter 9/10: OSS cache speed: 0.413008
Iter 9/10: ladvise speed: 0.409325
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.399648
Iter 10/10: OSS cache speed: 0.402209
Iter 10/10: ladvise speed: 0.461845
Average uncached read: .39
Average speedup with OSS cached read:  .43 = +10%
Average speedup with ladvise willread:  .44 = +12%
Speedup with OSS cached read less than 20%,  got 10%. Skipping ladvise willread check.
fail_loc=0