== sanity test 255a: check 'lfs ladvise -a willread' ===== 05:59:55 (1777024795)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.65677 s, 18.5 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-ffff95d3c8884800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 2.19355
Iter 1/10: OSS cache speed: 2.23077
Iter 1/10: ladvise speed: 2.46017
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.36361
Iter 2/10: OSS cache speed: 2.49178
Iter 2/10: ladvise speed: 2.45775
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.35866
Iter 3/10: OSS cache speed: 2.4092
Iter 3/10: ladvise speed: 2.32282
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.18956
Iter 4/10: OSS cache speed: 2.42393
Iter 4/10: ladvise speed: 2.43267
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.26672
Iter 5/10: OSS cache speed: 2.48392
Iter 5/10: ladvise speed: 2.50693
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.750651
Iter 6/10: OSS cache speed: 1.07564
Iter 6/10: ladvise speed: 1.04836
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.823708
Iter 7/10: OSS cache speed: 0.866862
Iter 7/10: ladvise speed: 0.929207
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.928235
Iter 8/10: OSS cache speed: 1.08987
Iter 8/10: ladvise speed: 1.03583
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.894082
Iter 9/10: OSS cache speed: 1.18989
Iter 9/10: ladvise speed: 1.16258
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.06399
Iter 10/10: OSS cache speed: 1.34195
Iter 10/10: ladvise speed: 1.92353
Average uncached read: 1.58
Average speedup with OSS cached read:  1.76 = +11%
Average speedup with ladvise willread:  1.82 = +15%
Speedup with OSS cached read less than 20%,  got 11%. Skipping ladvise willread check.
fail_loc=0