== sanity test 255a: check 'lfs ladvise -a willread' ===== 14:43:49 (1777574629)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 4.95609 s, 21.2 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-ffff89b447239000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 1.99527
Iter 1/10: OSS cache speed: 0.880135
Iter 1/10: ladvise speed: 0.327724
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.499495
Iter 2/10: OSS cache speed: 0.19656
Iter 2/10: ladvise speed: 0.330085
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.310967
Iter 3/10: OSS cache speed: 0.393809
Iter 3/10: ladvise speed: 0.320342
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.390883
Iter 4/10: OSS cache speed: 0.361079
Iter 4/10: ladvise speed: 0.349956
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.375656
Iter 5/10: OSS cache speed: 0.318013
Iter 5/10: ladvise speed: 0.412423
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.407772
Iter 6/10: OSS cache speed: 0.388104
Iter 6/10: ladvise speed: 0.393443
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.373345
Iter 7/10: OSS cache speed: 0.414838
Iter 7/10: ladvise speed: 0.426827
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.433056
Iter 8/10: OSS cache speed: 0.449799
Iter 8/10: ladvise speed: 0.399055
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.405173
Iter 9/10: OSS cache speed: 0.501634
Iter 9/10: ladvise speed: 0.430032
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.467415
Iter 10/10: OSS cache speed: 0.353685
Iter 10/10: ladvise speed: 0.398712
Average uncached read: .56
Average speedup with OSS cached read:  .42 = +-25%
Average speedup with ladvise willread:  .37 = +-33%
Speedup with OSS cached read less than 20%,  got -25%. Skipping ladvise willread check.
fail_loc=0