== sanity test 255a: check 'lfs ladvise -a willread' ===== 20:50:03 (1790729403)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.0366 s, 8.0 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-ffff983f84db8800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.340238
Iter 1/10: OSS cache speed: 0.417736
Iter 1/10: ladvise speed: 0.405943
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.365258
Iter 2/10: OSS cache speed: 0.447458
Iter 2/10: ladvise speed: 0.385846
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.438955
Iter 3/10: OSS cache speed: 0.393403
Iter 3/10: ladvise speed: 0.399286
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.385777
Iter 4/10: OSS cache speed: 0.412934
Iter 4/10: ladvise speed: 0.381732
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.337476
Iter 5/10: OSS cache speed: 0.398348
Iter 5/10: ladvise speed: 0.406628
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.36047
Iter 6/10: OSS cache speed: 0.346737
Iter 6/10: ladvise speed: 0.318084
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.321934
Iter 7/10: OSS cache speed: 0.334053
Iter 7/10: ladvise speed: 0.434993
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.334054
Iter 8/10: OSS cache speed: 0.397957
Iter 8/10: ladvise speed: 0.473407
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.45799
Iter 9/10: OSS cache speed: 0.384908
Iter 9/10: ladvise speed: 0.419491
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.452902
Iter 10/10: OSS cache speed: 0.383676
Iter 10/10: ladvise speed: 0.471767
Average uncached read: .37
Average speedup with OSS cached read:  .39 = +5%
Average speedup with ladvise willread:  .40 = +8%
Speedup with OSS cached read less than 20%,  got 5%. Skipping ladvise willread check.
fail_loc=0