== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:46:50 (1760453210)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.794856 s, 132 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=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 4.88979
Iter 1/10: OSS cache speed: 5.37319
Iter 1/10: ladvise speed: 5.17263
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.47677
Iter 2/10: OSS cache speed: 5.05176
Iter 2/10: ladvise speed: 5.81249
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.97356
Iter 3/10: OSS cache speed: 5.35492
Iter 3/10: ladvise speed: 6.28397
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.86234
Iter 4/10: OSS cache speed: 5.45741
Iter 4/10: ladvise speed: 5.53702
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.70187
Iter 5/10: OSS cache speed: 5.43736
Iter 5/10: ladvise speed: 5.58111
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.93294
Iter 6/10: OSS cache speed: 5.60159
Iter 6/10: ladvise speed: 5.92688
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.56144
Iter 7/10: OSS cache speed: 6.17458
Iter 7/10: ladvise speed: 5.55276
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.55249
Iter 8/10: OSS cache speed: 5.54193
Iter 8/10: ladvise speed: 5.39956
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.68604
Iter 9/10: OSS cache speed: 5.43326
Iter 9/10: ladvise speed: 5.12997
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.70326
Iter 10/10: OSS cache speed: 5.53163
Iter 10/10: ladvise speed: 4.89539
Average uncached read: 4.83
Average speedup with OSS cached read:  5.49 = +13.66%
Average speedup with ladvise willread:  5.52 = +14.28%
Speedup with OSS cached read less than 20%,  got 5.49%. Skipping ladvise willread check.