== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:44:54 (1788360294)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.84131 s, 15.3 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-ffff895690891800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.659636
Iter 1/10: OSS cache speed: 0.819571
Iter 1/10: ladvise speed: 1.31975
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.38054
Iter 2/10: OSS cache speed: 0.453897
Iter 2/10: ladvise speed: 0.522943
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.493308
Iter 3/10: OSS cache speed: 0.553492
Iter 3/10: ladvise speed: 0.544924
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.465055
Iter 4/10: OSS cache speed: 0.544232
Iter 4/10: ladvise speed: 0.548619
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.555002
Iter 5/10: OSS cache speed: 0.720613
Iter 5/10: ladvise speed: 0.77668
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.656157
Iter 6/10: OSS cache speed: 0.710306
Iter 6/10: ladvise speed: 0.797581
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.66099
Iter 7/10: OSS cache speed: 0.757676
Iter 7/10: ladvise speed: 0.962015
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.662816
Iter 8/10: OSS cache speed: 0.802253
Iter 8/10: ladvise speed: 0.924172
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.96588
Iter 9/10: OSS cache speed: 1.01215
Iter 9/10: ladvise speed: 1.27409
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.07709
Iter 10/10: OSS cache speed: 1.27483
Iter 10/10: ladvise speed: 1.46258
Average uncached read: .75
Average speedup with OSS cached read:  .76 = +1%
Average speedup with ladvise willread:  .91 = +21%
Speedup with OSS cached read less than 20%,  got 1%. Skipping ladvise willread check.
fail_loc=0