== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:27:06 (1786940826)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 9.10819 s, 11.5 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-ffff901b11fbe800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.47714
Iter 1/10: OSS cache speed: 0.59967
Iter 1/10: ladvise speed: 0.490683
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.383969
Iter 2/10: OSS cache speed: 0.524778
Iter 2/10: ladvise speed: 0.614715
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.529315
Iter 3/10: OSS cache speed: 0.592733
Iter 3/10: ladvise speed: 0.74713
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.675264
Iter 4/10: OSS cache speed: 0.180922
Iter 4/10: ladvise speed: 0.397141
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.364237
Iter 5/10: OSS cache speed: 0.342381
Iter 5/10: ladvise speed: 0.391127
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.383265
Iter 6/10: OSS cache speed: 0.487865
Iter 6/10: ladvise speed: 0.586157
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.508119
Iter 7/10: OSS cache speed: 0.555583
Iter 7/10: ladvise speed: 0.507264
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.551731
Iter 8/10: OSS cache speed: 0.65114
Iter 8/10: ladvise speed: 0.624941
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.566433
Iter 9/10: OSS cache speed: 0.657688
Iter 9/10: ladvise speed: 0.687649
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.590144
Iter 10/10: OSS cache speed: 0.707366
Iter 10/10: ladvise speed: 0.446737
Average uncached read: .50
Average speedup with OSS cached read:  .53 = +6%
Average speedup with ladvise willread:  .54 = +8%
Speedup with OSS cached read less than 20%,  got 6%. Skipping ladvise willread check.
fail_loc=0