== sanity test 255a: check 'lfs ladvise -a willread' ===== 01:34:10 (1787463250)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.0754 s, 8.0 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-ffff8d3646640800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.350038
Iter 1/10: OSS cache speed: 0.299774
Iter 1/10: ladvise speed: 0.471216
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.412478
Iter 2/10: OSS cache speed: 0.445661
Iter 2/10: ladvise speed: 0.430916
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.337912
Iter 3/10: OSS cache speed: 0.356753
Iter 3/10: ladvise speed: 0.343465
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.415454
Iter 4/10: OSS cache speed: 0.403282
Iter 4/10: ladvise speed: 0.454713
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.397739
Iter 5/10: OSS cache speed: 0.450513
Iter 5/10: ladvise speed: 0.409941
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.314394
Iter 6/10: OSS cache speed: 0.35367
Iter 6/10: ladvise speed: 0.340663
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.265935
Iter 7/10: OSS cache speed: 0.342086
Iter 7/10: ladvise speed: 0.322327
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.292203
Iter 8/10: OSS cache speed: 0.307434
Iter 8/10: ladvise speed: 0.314449
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.267443
Iter 9/10: OSS cache speed: 0.257333
Iter 9/10: ladvise speed: 0.357362
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.320364
Iter 10/10: OSS cache speed: 0.282257
Iter 10/10: ladvise speed: 0.324732
Average uncached read: .33
Average speedup with OSS cached read:  .34 = +3%
Average speedup with ladvise willread:  .37 = +12%
Speedup with OSS cached read less than 20%,  got 3%. Skipping ladvise willread check.
fail_loc=0