== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:17:57 (1788927477)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 11.126 s, 9.4 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-ffff9b3310218800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.391275
Iter 1/10: OSS cache speed: 0.502706
Iter 1/10: ladvise speed: 0.46352
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.372366
Iter 2/10: OSS cache speed: 0.466468
Iter 2/10: ladvise speed: 0.506325
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.383951
Iter 3/10: OSS cache speed: 0.357618
Iter 3/10: ladvise speed: 0.49169
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.432948
Iter 4/10: OSS cache speed: 0.432372
Iter 4/10: ladvise speed: 0.446325
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.335941
Iter 5/10: OSS cache speed: 0.504602
Iter 5/10: ladvise speed: 0.363953
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.439744
Iter 6/10: OSS cache speed: 0.504863
Iter 6/10: ladvise speed: 0.353716
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.336807
Iter 7/10: OSS cache speed: 0.425491
Iter 7/10: ladvise speed: 0.472461
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.357291
Iter 8/10: OSS cache speed: 0.489684
Iter 8/10: ladvise speed: 0.472335
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.448612
Iter 9/10: OSS cache speed: 0.519566
Iter 9/10: ladvise speed: 0.499779
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.343959
Iter 10/10: OSS cache speed: 0.511542
Iter 10/10: ladvise speed: 0.498374
Average uncached read: .38
Average speedup with OSS cached read:  .47 = +23%
Average speedup with ladvise willread:  .45 = +18%
fail_loc=0