== sanity test 255a: check 'lfs ladvise -a willread' ===== 02:50:42 (1787122242)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 10.2383 s, 10.2 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-ffff954ac7c45800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.40722
Iter 1/10: OSS cache speed: 0.411374
Iter 1/10: ladvise speed: 0.397808
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.411743
Iter 2/10: OSS cache speed: 0.392989
Iter 2/10: ladvise speed: 0.408298
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.419052
Iter 3/10: OSS cache speed: 0.331899
Iter 3/10: ladvise speed: 0.433915
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.347361
Iter 4/10: OSS cache speed: 0.440242
Iter 4/10: ladvise speed: 0.434436
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.41012
Iter 5/10: OSS cache speed: 0.400736
Iter 5/10: ladvise speed: 0.395392
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.368752
Iter 6/10: OSS cache speed: 0.379742
Iter 6/10: ladvise speed: 0.394707
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.300424
Iter 7/10: OSS cache speed: 0.332163
Iter 7/10: ladvise speed: 0.400095
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.396015
Iter 8/10: OSS cache speed: 0.41491
Iter 8/10: ladvise speed: 0.375159
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.358751
Iter 9/10: OSS cache speed: 0.383671
Iter 9/10: ladvise speed: 0.366061
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.329263
Iter 10/10: OSS cache speed: 0.373188
Iter 10/10: ladvise speed: 0.32802
Average uncached read: .37
Average speedup with OSS cached read:  .38 = +2%
Average speedup with ladvise willread:  .39 = +5%
Speedup with OSS cached read less than 20%,  got 2%. Skipping ladvise willread check.
fail_loc=0