Rustc Fails to Compile Piston with Illegal Instruction Error

[indiv0]

Attempting to compile the piston project results in the following error:

vagrant@vagrant-ubuntu-trusty-32:~/piston$ ./build.sh
--- Building /home/vagrant/piston
--- Deleted binaries and documentation
/bin/bash: line 1:  2037 Illegal instruction     (core dumped) rustc --target "i686-unknown-linux-gnu" --crate-type=rlib src/lib.rs -L "target/deps/" --out-dir "target"
make: *** [target/libpiston-a1b791b5-0.0.rlib] Error 132

Compiling a simple "Hello world!" function works fine, so the rust compiler is working.

Attempting to go through the piston issue tracker resulted in a dead end, as this appears to be an issue with rust. Full discussion can be viewed here.

Sidenote: as discussed on the piston issue tracker, is the high RAM use while compiling expected (>1G)?

rustc -v: rustc 0.11.0-pre
uname -a: Linux vagrant-ubuntu-trusty-32 3.13.0-29-generic #53-Ubuntu SMP Wed Jun 4 21:02:19 UTC 2014 i686 i686 i686 GNU/Linux

[sfackler]

It's hard to tell without a backtrace (could you run the rustc build in gdb?) but I'd imagine the illegal instruction is coming from a call to abort. Since memory use seems to be high, a good guess would be a malloc failure.

[indiv0]

Alright I'll give it a shot tomorrow.
On Jul 2, 2014 10:13 PM, "Steven Fackler" notifications@github.com wrote:

It's hard to tell without a backtrace (could you run the rustc build in
gdb?) but I'd imagine the illegal instruction is coming from a call to
abort. Since memory use seems to be high, a good guess would be a malloc
failure.

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#15346 (comment).

[indiv0]

I hope I did this right.

Here's the backtrace.

The testing environment is reproducible BTW using the Vagrant/Puppet provisioner for my project, in case you need to reproduce the issue.

[huonw]

How much memory do you have?

[sfackler]

Looks like 1G from the Vagrantfile: https://github.com/Indiv0/rust-ssb/blob/master/Vagrantfile

[indiv0]

The build is being run with 1G and peaking at 611M, as per the discussion
on the piston issue tracker.

The build is running inside a VM. I can retry the build with more RAM if
necessary.
On Jul 3, 2014 12:52 AM, "Huon Wilson" notifications@github.com wrote:

How much memory do you have?

—
Reply to this email directly or view it on GitHub
#15346 (comment).

[huonw]

Oh, yeah: can you try increasing it?

[indiv0]

Sure thing. Running with 4 Gb now.

[indiv0]

Build completes successfully. RAM usage peaked at 1488M. Any idea why it's going so high? Is this expected?

Just a few days ago I was able to successfully compile Piston in the VM with only 512M of RAM.

[huonw]

Yes, the compiler hasn't been optimised for performance much at all (neither time nor memory), most effort has been spent implementing the language rather than tweaking the implementation details of the compiler itself. (It's definitely annoying, but hopefully we'll be able to spend more time on the compiler once most of the backwards incompatible languages changes are done.)

Closing. (Thanks for filing!)

[gmorenz]

I've isolated the performance issues to a relatively small piece of code, specifically deriving PartialOrd and Ord on a long enum. While I appreciate that rustc isn't optimized for performance, it still seems like a bug to me that compiling the code below takes almost 1.6 gb of memory, and almost 2 minutes of time:

#[deriving(PartialEq, Eq, PartialOrd, Ord)]
pub enum Key {
    Unknown                 ,
    Backspace               ,
    Tab                     ,
    Return                  ,
    Escape                  ,
    Space                   ,
    Exclaim                 ,
    Quotedbl                ,
    Hash                    ,
    Dollar                  ,
    Percent                 ,
    Ampersand               ,
    Quote                   ,
    LeftParen               ,
    RightParen              ,
    Asterisk                ,
    Plus                    ,
    Comma                   ,
    Minus                   ,
    Period                  ,
    Slash                   ,
    D0                      ,
    D1                      ,
    D2                      ,
    D3                      ,
    D4                      ,
    D5                      ,
    D6                      ,
    D7                      ,
    D8                      ,
    D9                      ,
    Colon                   ,
    Semicolon               ,
    Less                    ,
    Equals                  ,
    Greater                 ,
    Question                ,
    At                      ,
    LeftBracket             ,
    Backslash               ,
    RightBracket            ,
    Caret                   ,
    Underscore              ,
    Backquote               ,
    A                       ,
    B                       ,
    C                       ,
    D                       ,
    E                       ,
    F                       ,
    G                       ,
    H                       ,
    I                       ,
    J                       ,
    K                       ,
    L                       ,
    M                       ,
    N                       ,
    O                       ,
    P                       ,
    Q                       ,
    R                       ,
    S                       ,
    T                       ,
    U                       ,
    V                       ,
    W                       ,
    X                       ,
    Y                       ,
    Z                       ,
    Delete                  ,
    CapsLock                ,
    F1                      ,
    F2                      ,
    F3                      ,
    F4                      ,
    F5                      ,
    F6                      ,
    F7                      ,
    F8                      ,
    F9                      ,
    F10                     ,
    F11                     ,
    F12                     ,
    PrintScreen             ,
    ScrollLock              ,
    Pause                   ,
    Insert                  ,
    Home                    ,
    PageUp                  ,
    End                     ,
    PageDown                ,
    Right                   ,
    Left                    ,
    Down                    ,
    Up                      ,
    NumLockClear            ,
    NumPadDivide            ,
    NumPadMultiply          ,
    NumPadMinus             ,
    NumPadPlus              ,
    NumPadEnter             ,
    NumPad1                 ,
    NumPad2                 ,
    NumPad3                 ,
    NumPad4                 ,
    NumPad5                 ,
    NumPad6                 ,
    NumPad7                 ,
    NumPad8                 ,
    NumPad9                 ,
    NumPad0                 ,
    NumPadPeriod            ,
    Application             ,
    Power                   ,
    NumPadEquals            ,
    F13                     ,
    F14                     ,
    F15                     ,
    F16                     ,
    F17                     ,
    F18                     ,
    F19                     ,
    F20                     ,
    F21                     ,
    F22                     ,
    F23                     ,
    F24                     ,
    Execute                 ,
    Help                    ,
    Menu                    ,
    Select                  ,
    Stop                    ,
    Again                   ,
    Undo                    ,
    Cut                     ,
    Copy                    ,
    Paste                   ,
    Find                    ,
    Mute                    ,
    VolumeUp                ,
    VolumeDown              ,
    NumPadComma             ,
    NumPadEqualsAS400       ,
    AltErase                ,
    Sysreq                  ,
    Cancel                  ,
    Clear                   ,
    Prior                   ,
    Return2                 ,
    Separator               ,
    Out                     ,
    Oper                    ,
    ClearAgain              ,
    CrSel                   ,
    ExSel                   ,
    NumPad00                ,
    NumPad000               ,
    ThousandsSeparator      ,
    DecimalSeparator        ,
    CurrencyUnit            ,
    CurrencySubUnit         ,
    NumPadLeftParen         ,
    NumPadRightParen        ,
    NumPadLeftBrace         ,
    NumPadRightBrace        ,
    NumPadTab               ,
    NumPadBackspace         ,
    NumPadA                 ,
    NumPadB                 ,
    NumPadC                 ,
    NumPadD                 ,
    NumPadE                 ,
    NumPadF                 ,
    NumPadXor               ,
    NumPadPower             ,
    NumPadPercent           ,
    NumPadLess              ,
    NumPadGreater           ,
    NumPadAmpersand         ,
    NumPadDblAmpersand      ,
    NumPadVerticalBar       ,
    NumPadDblVerticalBar    ,
    NumPadColon             ,
    NumPadHash              ,
    NumPadSpace             ,
    NumPadAt                ,
    NumPadExclam            ,
    NumPadMemStore          ,
    NumPadMemRecall         ,
    NumPadMemClear          ,
    NumPadMemAdd            ,
    NumPadMemSubtract       ,
    NumPadMemMultiply       ,
    NumPadMemDivide         ,
    NumPadPlusMinus         ,
    NumPadCear              ,
    NumPadClearEntry        ,
    NumPadBinary            ,
    NumPadOctal             ,
    NumPadDecimal           ,
    NumPadHexadecimal       ,
    LCtrl                   ,
    LShift                  ,
    LAlt                    ,
    LGui                    ,
    RCtrl                   ,
    RShift                  ,
    RAlt                    ,
    RGui                    ,
    Mode                    ,
    AudioNext               ,
    AudioPrev               ,
    AudioStop               ,
    AudioPlay               ,
    AudioMute               ,
    MediaSelect             ,
    Www                     ,
    Mail                    ,
    Calculator              ,
    Computer                ,
    AcSearch                ,
    AcHome                  ,
    AcBack                  ,
    AcForward               ,
    AcStop                  ,
    AcRefresh               ,
    AcBookmarks             ,
    BrightnessDown          ,
    BrightnessUp            ,
    DisplaySwitch           ,
    KbdIllumToggle          ,
    KbdIllumDown            ,
    KbdIllumUp              ,
    Eject                   ,
    Sleep                   ,
}

(Output from terminal when compiling using time to monitor resource usage)

$ /usr/bin/time -v rustc src/keyboard.rs --crate-type lib
    Command being timed: "rustc src/keyboard.rs --crate-type lib"
    User time (seconds): 106.55
    System time (seconds): 3.61
    Percent of CPU this job got: 94%
    Elapsed (wall clock) time (h:mm:ss or m:ss): 1:56.44
    Average shared text size (kbytes): 0
    Average unshared data size (kbytes): 0
    Average stack size (kbytes): 0
    Average total size (kbytes): 0
    Maximum resident set size (kbytes): 1597512
    Average resident set size (kbytes): 0
    Major (requiring I/O) page faults: 0
    Minor (reclaiming a frame) page faults: 443437
    Voluntary context switches: 1088
    Involuntary context switches: 11284
    Swaps: 0
    File system inputs: 16
    File system outputs: 1688128
    Socket messages sent: 0
    Socket messages received: 0
    Signals delivered: 0
    Page size (bytes): 4096
    Exit status: 0

[alexcrichton]

Oh dear, that is absurd!

I'm going to open a separate issue about that program.

[alexcrichton]

Opened as #15375