Hi all, I am not able to export an ALTREP object when `gctorture` is on in the worker. The package simplemmap can be used to reproduce the problem. See the example below ``` ## Create a temporary file filePath <- tempfile() con <- file(filePath, "wrb") writeBin(rep(0.0,10),con) close(con) library(simplemmap) library(parallel) cl <- makeCluster(1) x <- mmap(filePath, "double") ## Turn gctorture on clusterEvalQ(cl, gctorture()) clusterExport(cl, "x") ## x is an 0-length vector on the worker clusterEvalQ(cl, x) stopCluster(cl) ``` you can find more info on the problem if you manually build a connection between two R processes and export the ALTREP object. See output below ```> con <- socketConnection(port = 1234,server = FALSE) > gctorture() > x <- unserialize(con)Warning message: In unserialize(con) : cannot unserialize ALTVEC object of class 'mmap_real' from package 'simplemmap'; returning length zero vector ``` It seems like simplemmap did not get loaded correctly on the worker. If you run `library( simplemmap)` before unserializing the ALTREP, there will be no problem. But I suppose we should be able to unserialize objects without preloading the library? This issue can be reproduced on Ubuntu with R version 4.0.2 (2020-06-22) and Windows with R Under development (unstable) (2020-09-03 r79126). Here is the link to simplemmap: https://github.com/ALTREP-examples/Rpkg-simplemmap Best, Jiefei [[alternative HTML version deleted]]
iuke-tier@ey m@iii@g oii uiow@@edu
2020-Oct-29 16:46 UTC
[Rd] [External] Something is wrong with the unserialize function
Thanks for the report. Will look into it when I get a chance unless
someone else gets there first.
A simpler reprex:
## create and serialize a memmory-mapped file object
filePath <- "x.dat"
con <- file(filePath, "wrb")
writeBin(rep(0.0,10),con)
close(con)
library(simplemmap)
x <- mmap(filePath, "double")
saveRDS(x, file = "x.Rds")
## in a separate R process:
gctorture()
readRDS("x.Rds")
Looks like a missing PROTECT somewhere.
Best,
luke
On Thu, 29 Oct 2020, Jiefei Wang wrote:
> Hi all,
>
> I am not able to export an ALTREP object when `gctorture` is on in the
> worker. The package simplemmap can be used to reproduce the problem. See
> the example below
> ```
> ## Create a temporary file
> filePath <- tempfile()
> con <- file(filePath, "wrb")
> writeBin(rep(0.0,10),con)
> close(con)
>
> library(simplemmap)
> library(parallel)
> cl <- makeCluster(1)
> x <- mmap(filePath, "double")
> ## Turn gctorture on
> clusterEvalQ(cl, gctorture())
> clusterExport(cl, "x")
> ## x is an 0-length vector on the worker
> clusterEvalQ(cl, x)
> stopCluster(cl)
> ```
>
> you can find more info on the problem if you manually build a connection
> between two R processes and export the ALTREP object. See output below
> ```
>> con <- socketConnection(port = 1234,server = FALSE)
>> gctorture()
>> x <- unserialize(con)
> Warning message:
> In unserialize(con) :
> cannot unserialize ALTVEC object of class 'mmap_real' from package
> 'simplemmap'; returning length zero vector
> ```
> It seems like simplemmap did not get loaded correctly on the worker. If
> you run `library( simplemmap)` before unserializing the ALTREP, there will
> be no problem. But I suppose we should be able to unserialize objects
> without preloading the library?
>
> This issue can be reproduced on Ubuntu with R version 4.0.2 (2020-06-22)
> and Windows with R Under development (unstable) (2020-09-03 r79126).
>
> Here is the link to simplemmap:
> https://github.com/ALTREP-examples/Rpkg-simplemmap
>
> Best,
> Jiefei
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
--
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tierney at uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
Martin Morgan
2020-Oct-29 17:10 UTC
[Rd] [External] Something is wrong with the unserialize function
This
Index: src/main/altrep.c
==================================================================---
src/main/altrep.c (revision 79385)
+++ src/main/altrep.c (working copy)
@@ -275,10 +275,11 @@
SEXP psym = ALTREP_SERIALIZED_CLASS_PKGSYM(info);
SEXP class = LookupClass(csym, psym);
if (class == NULL) {
- SEXP pname = ScalarString(PRINTNAME(psym));
+ SEXP pname = PROTECT(ScalarString(PRINTNAME(psym)));
R_tryCatchError(find_namespace, pname,
handle_namespace_error, NULL);
class = LookupClass(csym, psym);
+ UNPROTECT(1);
}
return class;
}
seems to remove the warning; I'm guessing that the other SEXP already exist
so don't need protecting?
Martin Morgan
?On 10/29/20, 12:47 PM, "R-devel on behalf of luke-tierney at
uiowa.edu" <r-devel-bounces at r-project.org on behalf of luke-tierney
at uiowa.edu> wrote:
Thanks for the report. Will look into it when I get a chance unless
someone else gets there first.
A simpler reprex:
## create and serialize a memmory-mapped file object
filePath <- "x.dat"
con <- file(filePath, "wrb")
writeBin(rep(0.0,10),con)
close(con)
library(simplemmap)
x <- mmap(filePath, "double")
saveRDS(x, file = "x.Rds")
## in a separate R process:
gctorture()
readRDS("x.Rds")
Looks like a missing PROTECT somewhere.
Best,
luke
On Thu, 29 Oct 2020, Jiefei Wang wrote:
> Hi all,
>
> I am not able to export an ALTREP object when `gctorture` is on in the
> worker. The package simplemmap can be used to reproduce the problem.
See
> the example below
> ```
> ## Create a temporary file
> filePath <- tempfile()
> con <- file(filePath, "wrb")
> writeBin(rep(0.0,10),con)
> close(con)
>
> library(simplemmap)
> library(parallel)
> cl <- makeCluster(1)
> x <- mmap(filePath, "double")
> ## Turn gctorture on
> clusterEvalQ(cl, gctorture())
> clusterExport(cl, "x")
> ## x is an 0-length vector on the worker
> clusterEvalQ(cl, x)
> stopCluster(cl)
> ```
>
> you can find more info on the problem if you manually build a
connection
> between two R processes and export the ALTREP object. See output below
> ```
>> con <- socketConnection(port = 1234,server = FALSE)
>> gctorture()
>> x <- unserialize(con)
> Warning message:
> In unserialize(con) :
> cannot unserialize ALTVEC object of class 'mmap_real' from
package
> 'simplemmap'; returning length zero vector
> ```
> It seems like simplemmap did not get loaded correctly on the worker.
If
> you run `library( simplemmap)` before unserializing the ALTREP, there
will
> be no problem. But I suppose we should be able to unserialize objects
> without preloading the library?
>
> This issue can be reproduced on Ubuntu with R version 4.0.2
(2020-06-22)
> and Windows with R Under development (unstable) (2020-09-03 r79126).
>
> Here is the link to simplemmap:
> https://github.com/ALTREP-examples/Rpkg-simplemmap
>
> Best,
> Jiefei
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
--
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tierney at uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
______________________________________________
R-devel at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
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