== sanity test 255a: check 'lfs ladvise -a willread' ===== 23:20:45 (1764735645)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 7.13563 s, 14.7 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-ffff984e43142000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.72114
Iter 1/10: OSS cache speed: 0.76445
Iter 1/10: ladvise speed: 0.688166
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.611785
Iter 2/10: OSS cache speed: 0.715262
Iter 2/10: ladvise speed: 0.729978
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.610424
Iter 3/10: OSS cache speed: 0.438748
Iter 3/10: ladvise speed: 0.537369
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.479007
Iter 4/10: OSS cache speed: 0.534047
Iter 4/10: ladvise speed: 0.534228
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.499148
Iter 5/10: OSS cache speed: 0.556113
Iter 5/10: ladvise speed: 0.583738
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.291391
Iter 6/10: OSS cache speed: 0.494209
Iter 6/10: ladvise speed: 0.536816
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.47867
Iter 7/10: OSS cache speed: 0.523372
Iter 7/10: ladvise speed: 0.585897
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.613733
Iter 8/10: OSS cache speed: 0.76231
Iter 8/10: ladvise speed: 0.987351
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.840176
Iter 9/10: OSS cache speed: 0.945485
Iter 9/10: ladvise speed: 0.806674
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.697439
Iter 10/10: OSS cache speed: 1.12616
Iter 10/10: ladvise speed: 1.38666
Average uncached read: .58
Average speedup with OSS cached read:  .68 = +17%
Average speedup with ladvise willread:  .73 = +25%
Speedup with OSS cached read less than 20%,  got 17%. Skipping ladvise willread check.
fail_loc=0