== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:43:34 (1790693014)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.7898 s, 7.6 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-ffff9da991acc000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.444268
Iter 1/10: OSS cache speed: 0.428226
Iter 1/10: ladvise speed: 0.511335
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.499561
Iter 2/10: OSS cache speed: 0.555676
Iter 2/10: ladvise speed: 0.555999
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.504469
Iter 3/10: OSS cache speed: 0.455218
Iter 3/10: ladvise speed: 0.438448
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.38113
Iter 4/10: OSS cache speed: 0.562431
Iter 4/10: ladvise speed: 0.486284
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.421869
Iter 5/10: OSS cache speed: 0.422997
Iter 5/10: ladvise speed: 0.527094
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.449614
Iter 6/10: OSS cache speed: 0.563146
Iter 6/10: ladvise speed: 0.574442
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.527931
Iter 7/10: OSS cache speed: 0.530764
Iter 7/10: ladvise speed: 0.403963
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.405869
Iter 8/10: OSS cache speed: 0.371276
Iter 8/10: ladvise speed: 0.398465
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.44342
Iter 9/10: OSS cache speed: 0.463883
Iter 9/10: ladvise speed: 0.456786
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.413877
Iter 10/10: OSS cache speed: 0.415615
Iter 10/10: ladvise speed: 0.468794
Average uncached read: .44
Average speedup with OSS cached read:  .47 = +6%
Average speedup with ladvise willread:  .48 = +9%
Speedup with OSS cached read less than 20%,  got 6%. Skipping ladvise willread check.
fail_loc=0