== sanity test 255a: check 'lfs ladvise -a willread' ===== 01:18:17 (1784697497)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 9.09987 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-ffffa0665aa45800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.504918
Iter 1/10: OSS cache speed: 0.606887
Iter 1/10: ladvise speed: 0.303259
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.375357
Iter 2/10: OSS cache speed: 0.404497
Iter 2/10: ladvise speed: 0.445269
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.41986
Iter 3/10: OSS cache speed: 0.574028
Iter 3/10: ladvise speed: 0.560233
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.506781
Iter 4/10: OSS cache speed: 0.636255
Iter 4/10: ladvise speed: 0.653257
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.580075
Iter 5/10: OSS cache speed: 0.608007
Iter 5/10: ladvise speed: 0.603861
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.588418
Iter 6/10: OSS cache speed: 0.79354
Iter 6/10: ladvise speed: 0.98572
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.878826
Iter 7/10: OSS cache speed: 1.08869
Iter 7/10: ladvise speed: 1.06397
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.928222
Iter 8/10: OSS cache speed: 1.18896
Iter 8/10: ladvise speed: 1.35518
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.932468
Iter 9/10: OSS cache speed: 1.17582
Iter 9/10: ladvise speed: 1.37565
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.28176
Iter 10/10: OSS cache speed: 1.51875
Iter 10/10: ladvise speed: 1.54637
Average uncached read: .69
Average speedup with OSS cached read:  .85 = +23%
Average speedup with ladvise willread:  .88 = +27%
fail_loc=0