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Nimithier
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Joined: 05 Aug 2012
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re: Warg Attack Lag!

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If any of you have done any pvmp lately, you may have had an event where a warg attacks you and you are dead before you can do anything. I've even turned on time-stamping in my log and it appears that multiple attack skills are all firing at once, leaving my client locked until I'm already dead. I even hit Hunter's Cry immediately after being pounced, but it never went off!

Michaleo and I were both curious about this so we I did a little experimentation (me on my warg and him as a freep) and discovered that when I simply appeared (un-hid) in front of him, his client briefly locked up while his performance monitor showed a bunch of disk I/O, indicating that the lock up was caused by the client loading from disk (in what's called an I/O wait state). We continued this test on various other warg attack skills, each caused a brief lock up the first time they were executed (with disk I/O). However, (as I had expected) re-appearing or repeating an attack skill a second time did not cause this, as likely the data for those sounds, animations and particle textures were already loaded

So I'm hypothesizing that pre-loading this data, at least at the operating system level, may prevent this lag, although the client will still have to read it in (hopefully from the OS file cache), decompress it etc, this should be much faster than hitting 283 separate places on disk. I would venture to guess that people with SSDs may not experience this lag at all (or as badly). So for anybody interested in trying, I have logged (via strace on Linux) the file reads that occur when performing a full barrage of a typical warg attack. I haven't yet written a script or program to do this read, but here is the information anyway. Also note that this was with the R6 warg skin and any other skin would not be loaded by this, although I'm guessing that this is just the two reads from the highres* files.

File Name            Offset    Size
========= ====== ====
client_gamelogic.dat 107389100 296 client_gamelogic.dat 131362372 487 client_gamelogic.dat 131384932 2460 client_gamelogic.dat 135179296 550 client_gamelogic.dat 135185588 2460 client_gamelogic.dat 158689204 296 client_gamelogic.dat 158689756 2460 client_gamelogic.dat 158700340 586 client_gamelogic.dat 158762852 568 client_gamelogic.dat 158782428 2460 client_gamelogic.dat 211610296 427 client_gamelogic.dat 217923412 427 client_gamelogic.dat 218040596 526 client_gamelogic.dat 220178076 557 client_gamelogic.dat 225554192 568 client_gamelogic.dat 225555896 487 client_gamelogic.dat 225559064 487 client_gamelogic.dat 225560120 487 client_gamelogic.dat 228986256 243 client_gamelogic.dat 230385552 134 client_gamelogic.dat 230806600 556 client_gamelogic.dat 232168320 607 client_gamelogic.dat 237765500 283 client_gamelogic.dat 238296740 2019 client_gamelogic.dat 247014828 1485 client_gamelogic.dat 247037588 556 client_gamelogic.dat 251890468 243 client_gamelogic.dat 254668072 556 client_gamelogic.dat 287020824 3489 client_gamelogic.dat 290300012 50 client_gamelogic.dat 2915480 2342 client_gamelogic.dat 291932444 1912 client_gamelogic.dat 292346496 26 client_gamelogic.dat 295251348 2460 client_gamelogic.dat 295266540 380 client_gamelogic.dat 307735008 364 client_gamelogic.dat 312461412 3531 client_gamelogic.dat 313832056 462 client_gamelogic.dat 313833988 517 client_gamelogic.dat 313834872 373 client_gamelogic.dat 323120860 434 client_gamelogic.dat 323121296 440 client_gamelogic.dat 323121736 437 client_gamelogic.dat 323122176 440 client_gamelogic.dat 323122616 437 client_gamelogic.dat 323123056 434 client_gamelogic.dat 323123492 435 client_gamelogic.dat 323123928 436 client_gamelogic.dat 323124364 434 client_gamelogic.dat 323124800 433 client_gamelogic.dat 323125236 435 client_gamelogic.dat 323125672 431 client_gamelogic.dat 323126104 434 client_gamelogic.dat 323126540 435 client_gamelogic.dat 323126976 435 client_gamelogic.dat 323127412 436 client_gamelogic.dat 323127848 435 client_gamelogic.dat 323128284 432 client_gamelogic.dat 323128716 433 client_gamelogic.dat 323129152 431 client_gamelogic.dat 323659072 399 client_gamelogic.dat 323659728 359 client_gamelogic.dat 323660344 317 client_gamelogic.dat 323693856 3489 client_gamelogic.dat 324137620 532 client_gamelogic.dat 349654428 401 client_gamelogic.dat 35607656 3489 client_gamelogic.dat 361966440 3567 client_gamelogic.dat 370926644 4841 client_gamelogic.dat 370931488 2374 client_gamelogic.dat 405683676 492 client_gamelogic.dat 405691832 2290 client_gamelogic.dat 405706580 2460 client_gamelogic.dat 410497160 528 client_gamelogic.dat 418806792 2460 client_gamelogic.dat 418809856 364 client_gamelogic.dat 418833456 592 client_gamelogic.dat 418929000 524 client_gamelogic.dat 418958772 2460 client_gamelogic.dat 494178492 2304 client_gamelogic.dat 497620480 459 client_gamelogic.dat 49837504 1397 client_gamelogic.dat 507204040 438 client_gamelogic.dat 507340392 492 client_gamelogic.dat 50914524 296 client_gamelogic.dat 510191044 1930 client_gamelogic.dat 51148500 78 client_gamelogic.dat 519121624 524 client_gamelogic.dat 519123196 484 client_gamelogic.dat 519126220 484 client_gamelogic.dat 519127228 484 client_gamelogic.dat 523948032 1780 client_gamelogic.dat 524576976 302 client_gamelogic.dat 526438640 58 client_gamelogic.dat 526962216 998 client_gamelogic.dat 528437376 568 client_gamelogic.dat 53224476 2460 client_gamelogic.dat 53238424 296 client_gamelogic.dat 534464616 427 client_gamelogic.dat 535205224 926 client_gamelogic.dat 537001456 3489 client_gamelogic.dat 539756300 3489 client_gamelogic.dat 547171172 998 client_gamelogic.dat 556039376 335 client_gamelogic.dat 559901876 998 client_gamelogic.dat 583584020 2330 client_gamelogic.dat 584444 2276 client_gamelogic.dat 602143604 2262 client_gamelogic.dat 62317536 296 client_gamelogic.dat 623820 2526 client_gamelogic.dat 65525180 472 client_gamelogic.dat 65525652 2460 client_gamelogic.dat 65529296 538 client_gamelogic.dat 65530132 296 client_gamelogic.dat 72532548 666 client_gamelogic.dat 72535676 666 client_gamelogic.dat 72536344 666 client_gamelogic.dat 72537012 666 client_gamelogic.dat 72537680 666 client_gamelogic.dat 72538348 666 client_gamelogic.dat 72539016 666 client_gamelogic.dat 72539684 666 client_gamelogic.dat 72540352 666 client_gamelogic.dat 72541020 666 client_gamelogic.dat 72541688 666 client_gamelogic.dat 72542356 666 client_gamelogic.dat 72543024 666 client_gamelogic.dat 72543692 666 client_gamelogic.dat 72544360 666 client_gamelogic.dat 72545028 666 client_gamelogic.dat 72545696 666 client_gamelogic.dat 72546364 666 client_gamelogic.dat 72547032 666 client_gamelogic.dat 72547700 666 client_gamelogic.dat 73039296 707 client_gamelogic.dat 73040316 626 client_gamelogic.dat 73041256 566 client_gamelogic.dat 73261624 2318 client_gamelogic.dat 73362784 3563 client_gamelogic.dat 73372636 568 client_gamelogic.dat 85049960 686 client_general.dat 197333156 872 client_general.dat 209958540 510 client_highres_aux_1.datx 2010742796 2460 client_highres.dat 2797145964 2460 client_local_English.dat 606140816 8525 client_local_English.dat 606197740 1176 client_local_English.dat 606488340 5629 client_local_English.dat 606540820 36350 client_local_English.dat 606830016 477 client_local_English.dat 607230552 1132 client_local_English.dat 608129676 206 client_local_English.dat 608136332 2460 client_local_English.dat 613197096 244 client_local_English.dat 613232408 2460 client_local_English.dat 615592028 314 client_local_English.dat 615592344 198 client_local_English.dat 615592856 106 client_local_English.dat 615600072 2460 client_local_English.dat 617945936 196 client_local_English.dat 618185260 135 client_local_English.dat 618186964 208 client_local_English.dat 618187220 425 client_local_English.dat 618193136 2460 client_local_English.dat 624007824 162 client_local_English.dat 634456652 230 client_local_English.dat 640958176 48 client_local_English.dat 640958688 415 client_local_English.dat 640959616 302 client_local_English.dat 640961528 327 client_local_English.dat 640963996 2460 client_local_English.dat 643134416 58 client_local_English.dat 646243948 150 client_local_English.dat 646248600 60 client_local_English.dat 646261316 505 client_local_English.dat 646266264 2460 client_local_English.dat 665280812 17629 client_local_English.dat 670657316 74 client_local_English.dat 673698876 367 client_local_English.dat 673722192 457 client_local_English.dat 673747388 58 client_local_English.dat 673760772 2460 client_local_English.dat 673784536 62 client_local_English.dat 673785560 397 client_local_English.dat 673792460 2460 client_local_English.dat 677564308 172 client_local_English.dat 677565716 156 client_local_English.dat 677565972 253 client_local_English.dat 677566484 184 client_local_English.dat 681149796 220 client_local_English.dat 681164212 2460 client_local_English.dat 682616736 10752 client_local_English.dat 683543232 110 client_surface.dat 1397867660 4128 client_surface.dat 1793202536 3037 client_surface.dat 1877682964 3784 client_surface.dat 1901606500 2460 client_surface.dat 1901614692 3201 client_surface.dat 1901643396 4128 client_surface.dat 1901745524 2460 client_surface.dat 1985316408 6227 client_surface.dat 224464464 3104 client_surface.dat 224603180 2460 client_surface.dat 2310688264 2623 client_surface.dat 2310721032 2868 client_surface.dat 2310737416 2882 client_surface.dat 2310741512 2973 client_surface.dat 2310766088 3098 client_surface.dat 2310786568 3137 client_surface.dat 2310794760 3727 client_surface.dat 2310807048 3096 client_surface.dat 2310815240 3119 client_surface.dat 2310827528 3027 client_surface.dat 2310835720 3038 client_surface.dat 2310848008 2887 client_surface.dat 2310856200 2949 client_surface.dat 2310868488 2854 client_surface.dat 2310893064 2672 client_surface.dat 2310901256 2667 client_surface.dat 2310913544 2601 client_surface.dat 2949376108 2976 client_surface.dat 2983774524 160 client_surface.dat 2983778620 544 client_surface.dat 2983782716 40 client_surface.dat 2983786812 2080 client_surface.dat 2983790908 64 client_surface.dat 3349450824 1169 client_surface.dat 3364522716 537 client_surface.dat 3365502480 554 client_surface.dat 3366241804 556 client_surface.dat 3366254092 544 client_surface.dat 3366274572 543 client_surface.dat 3366282764 530 client_surface.dat 3366286860 555 client_surface.dat 3366299148 530 client_surface.dat 3366303244 531 client_surface.dat 3366307340 556 client_surface.dat 3366331916 542 client_surface.dat 3481989732 2852 client_surface.dat 3482006148 3158 client_surface.dat 3482010244 3204 client_surface.dat 3483379852 130 client_surface.dat 389838860 1309 client_surface.dat 391869204 128 client_surface.dat 392636056 8311 client_surface.dat 392644368 8326 client_surface.dat 392652696 8302 client_surface.dat 392661000 8334 client_surface.dat 392669336 8233 client_surface.dat 392677572 8181 client_surface.dat 392685756 7988 client_surface.dat 392693744 7872 client_surface.dat 392701616 7861 client_surface.dat 392709480 7737 client_surface.dat 392721316 7805 client_surface.dat 392729124 7789 client_surface.dat 392736916 7744 client_surface.dat 392744660 7563 client_surface.dat 392752224 7585 client_surface.dat 392759812 7444 client_surface.dat 392767256 7371 client_surface.dat 392774628 7462 client_surface.dat 392782092 7587 client_surface.dat 392797272 7740 client_surface.dat 392805012 7828 client_surface.dat 392812840 7767 client_surface.dat 392820608 7790 client_surface.dat 392828400 7843 client_surface.dat 392836244 7893 client_surface.dat 392844140 8024 client_surface.dat 392885148 8336 client_surface.dat 396507100 2167 client_surface.dat 396609500 2460 client_surface.dat 399898800 2357 client_surface.dat 4262759060 24372 client_surface.dat 4262798264 2460 client_surface.dat 432009376 4128 client_surface.dat 432017632 4128 client_surface.dat 432039628 2460 client_surface.dat 557764700 2615 client_surface.dat 644660 4128 client_surface.dat 92640516 2230

In the end, it all comes down to the client putting appearance before performance. A more modern game engine will replace fancy textures & such with grey placeholders and load the data in the background, allowing the player to still respond rather than locking up their client (even though the mob may briefly look stupid). Maybe Turbine developers all use SSDs and can't imagine anybody else not spending money every time a new gadget comes out.

Nimithier

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