== sanity test 255a: check 'lfs ladvise -a willread' ===== 06:12:00 (1789985520)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.73508 s, 18.3 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-ffffa01286c86800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 1.61604
Iter 1/10: OSS cache speed: 0.773998
Iter 1/10: ladvise speed: 0.984924
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.841595
Iter 2/10: OSS cache speed: 0.773467
Iter 2/10: ladvise speed: 0.326969
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.462518
Iter 3/10: OSS cache speed: 0.488662
Iter 3/10: ladvise speed: 0.307077
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.380586
Iter 4/10: OSS cache speed: 0.422824
Iter 4/10: ladvise speed: 0.391853
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.413319
Iter 5/10: OSS cache speed: 0.339068
Iter 5/10: ladvise speed: 0.339819
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.36543
Iter 6/10: OSS cache speed: 0.376157
Iter 6/10: ladvise speed: 0.418051
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.422362
Iter 7/10: OSS cache speed: 0.391644
Iter 7/10: ladvise speed: 0.373493
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.428333
Iter 8/10: OSS cache speed: 0.418497
Iter 8/10: ladvise speed: 0.394628
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.380241
Iter 9/10: OSS cache speed: 0.353374
Iter 9/10: ladvise speed: 0.353969
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.39661
Iter 10/10: OSS cache speed: 0.408302
Iter 10/10: ladvise speed: 0.425766
Average uncached read: .57
Average speedup with OSS cached read:  .47 = +-17%
Average speedup with ladvise willread:  .43 = +-24%
Speedup with OSS cached read less than 20%,  got -17%. Skipping ladvise willread check.
fail_loc=0