== sanity test 255a: check 'lfs ladvise -a willread' ===== 20:31:23 (1770687083)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 8.14909 s, 12.9 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-ffff978a84c2d000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.492278
Iter 1/10: OSS cache speed: 0.513011
Iter 1/10: ladvise speed: 0.506816
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.533578
Iter 2/10: OSS cache speed: 0.554001
Iter 2/10: ladvise speed: 0.570125
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.60948
Iter 3/10: OSS cache speed: 0.558915
Iter 3/10: ladvise speed: 0.686654
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.74951
Iter 4/10: OSS cache speed: 0.765286
Iter 4/10: ladvise speed: 0.921868
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.841341
Iter 5/10: OSS cache speed: 0.968944
Iter 5/10: ladvise speed: 0.949983
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.848716
Iter 6/10: OSS cache speed: 0.956416
Iter 6/10: ladvise speed: 1.03109
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.952917
Iter 7/10: OSS cache speed: 1.17604
Iter 7/10: ladvise speed: 1.1146
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.34397
Iter 8/10: OSS cache speed: 1.31016
Iter 8/10: ladvise speed: 0.887618
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.1636
Iter 9/10: OSS cache speed: 1.10576
Iter 9/10: ladvise speed: 1.13502
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.25144
Iter 10/10: OSS cache speed: 1.36141
Iter 10/10: ladvise speed: 1.62391
Average uncached read: .87
Average speedup with OSS cached read:  .92 = +5%
Average speedup with ladvise willread:  .94 = +8%
Speedup with OSS cached read less than 20%,  got 5%. Skipping ladvise willread check.
fail_loc=0